Having read ch. 850 and seen all the arguments about whether Pudding is on the Straw Hat's side or Big Mom's side, I've come to the conclusion that maybe she's neither. Maybe she's playing both sides for her own gain. And who else do we know is plotting to betray Big Mom? That's right, Capone. I believe that Pudding and Capone are in cahoots, but before you get on my case, just hear me out and it'll all make sense. Tinfoil hat time:
Premise #1: Pudding's flashbacks are about her desire for freedom
The main crux of this theory lies in the contradictions between what we saw in chapter 848 and this chapter. For those of you who don't remember, in chapter 848, Pudding had a flashback while she was in her residence, reminiscing about Lola. Now, the stalwart defenders of Pudding's innocence are quick to point out that it doesn't make sense for Pudding to be having these thoughts if she was truly evil. If that were the case, then Oda would be straight up lying to us for a cheap plot twist. And I think you're right, but not for the same reasons.
There is one common point to all of her flashbacks: Big Mom's control over her life. Even in 850 we see this theme pop up when she tells Reiju that she is getting sick of all the pampering by her mother. Now how unreasonable would it be to think that someone like Pudding would snap? Someone whose entire purpose in life thus far has been to be Momma's "sweet little doll"? If you were in her position, wouldn't you want to break free of these shackles? These are not random moments of doubt she's having. No, she is reinforcing her belief that she's doing the right thing in betraying Big Mom by remembering how screwed up her life has been because of her, which brings me to my next point...
Premise #2: All of Big Mom's children are crazy and Pudding is no exception
If there's just one point that we can all agree on, it's that all of Big Mom's children are in some way, shape or form disturbed. Yes, even Lola, whose fetish is literally hunting down husbands. That's not what I call even remotely normal. But I digress.
Pudding is no different. Do you remember that oddly placed scene with the little girl asking for a knife to mutilate her stuffed toy? Or that scene with the caterpillar biker kid proclaiming he's not gonna brush his teeth? Those scenes were there for a very good reason. They showed us that the social cohesion in Big Mom's family is falling apart. In other words, Big Mom's children are all out to get one another or are just plain crazy, and the only thing keeping them together, both mentally and physically, is Big Mom herself. Now why would Pudding be any different? A woman clearly influenced by her sister's ideal of freedom wouldn't vest her loyalty in the very person robbing her of that freedom. No, she would bide her time until an opportunity presents itself, and there is no better an opportunity than this one...
Premise #3: Capone is Pudding's ticket out of Big Mom's clutches
Some of you might be asking yourselves, "Well if Big Mom's children are so rebellious, why didn't they team up against Big Mom?" That's simple - they can't. You saw what happened to Muscato, right? Unlike Brook, they don't stand a ghost of a chance against their mother. Furthermore, not everyone seems to be such a wild card. Her Commanders, the strongest warriors she has, all seem to be very loyal to her and have so far not shown any signs of doubt or rebellious behaviour. In short, the Charlotte family is too wild and disorganized to be able to rally against their tyrannical mother. But what if someone else showed up, someone who's also from the inside but who's also as opportunistic as Big Mom herself? Yes, I'm talking about Capone.
Although he's obviously not that strong, Capone's main asset is his intelligence. Having been based on Italian Mafia dons, Capone is someone who would naturally have a penchant for sly tactics and strategically outmaneuvering his enemies. We saw this all the way back in Sabaody where he effortlessly escaped the Buster Call, leaving the rest of the Supernova to deal with Kizaru and his forces. So we know he has a plan to deal with Big mom, too, we just don't know what it is, yet. Or perhaps we do...
Premise #4: Capone's plan is to instigate animosity between Big Mom and the Vinsmokes
Capone is not Kidd stupid, he knows he can't take down a Yonko and their crew all on his own. But he doesn't need to, he has the Germa to do that for him. The Community has long been speculating that Capone might turn the Vinsmokes against Big Mom and capitalize on the conflict to take her down, and that is what I believe, too. However, me and other like-minded individuals are taking it one step further by proposing that Pudding is actively assisting Capone in creating that conflict, and this is where the other inconsistencies come into play...
Premise #5: Pudding is using Luffy to her advantage
So far we have given Pudding a plausible background, motive and an accomplice, but how do we explain her actions in these past few chapters? Why did she go out of her way to antagonize the Straw Hats, all the while spilling the beans on Reiju about what Big Mom's plans for the wedding are? Well, you should know from what I've written above that this is exactly what she needs to do in order to set Capone's plan into motion. All of this has been to motivate the key players of this conflict under the nose of Big Mom. That is why she kept up her act in front of her siblings even though they know her real personality, and that is why she told both Reiju and Luffy. At this point, Capone can use all the help he can get in weakening Big Mom's forces, so a wild Luffy is exactly what he needs to appear, and what better way than to tell him that his beloved crew member is gonna bite the dust by none other than the girl he trusted to help him. He's banking on Luffy to escape and repeat his exploits on Dressrosa, and possibly help him defeat Big Mom.
Conclusion:
In summary, Pudding is working with Capone, because she wants to break free from Big Mom. In order to do so, she and Capone have devised a plan to cause a conflict between Luffy, the Vinsmokes and Big Mom. Their hope is that this will be enough for each of them to obtain their goal.
This is why Pudding has been putting up an act around her own family and why she said all those things to Luffy and Reiju. This is all a plot to take down Big Mom.
TL;DR:
Freedom-loving Pudding and opportunistic Capone are conspiring against Big Mom, and they're using Luffy and the Vinsmokes to help take her down.