You realize that it actually is a big hint towards Luke being her actual father in that very scene and dialogue right?
.
I see how it can be read that way, but I don't think that it is.
My problem with the "Luke gave her up for adoption" theory is the age at which she's left on Jakku, which is years before Ben turns and becomes Kylo. Why would Luke give her up? Why would her adoptive parents abandon her? There's almost no reason for any of that to happen if there's a familial connection with Luke, I don't think. It doesn't make much story sense for him to give up his kid at a time when he's so put together he's starting Jedi temples, training people, the galaxy is more or less at peace... don't see why he'd give up his kid. Much less give him up to two people who then ditched her on Jakku with Unkar Plutt.
None of that makes sense unless Luke is in some sort of frightened/disadvantaged position wherein he can't take care of his kid. But that doesn't really seem to jibe well with the timeline.
So it seems more plausible to me to take Maz at face value when she delineates between "your family" and "Luke" as if they're two separate things. Give up on the hope of your family returning, and go get a new family instead. Stop waiting on the past, and instead build a better future.
She can still be Luke's family without having to be born to him. Basically I guess I'm coming at this adoption angle from the other end: I don't think she was adopted out from Luke because he bailed on his responsibilities as a parent (bailing on responsibility obviously came afterwards, when his nephew lost his fuckin mind), but I think she will become Luke's "daughter" via her time learning from him.
To top it off ALL the visions relate to Luke to some level, but several visions do not relate to Ben at all, including the fight on Bespin.
Who needs the visions to
relate to Ben when Ben is
directly speaking to her. For all we know, Ben's
showing them to her. Specifically. Past, future, the path of that saber, the people it will affect, the people it's affected.
But the fact Ben is speaking to her from the vision likely means
something.