I already gave her Gronnblade+! I saved a 5* Nino with bad IVs from the banner a while back.
Holy crap. You're almost there. This is exciting!
Okay so the core of this team, what makes it work, is the combination of Fortify Fliers from Caeda and Hone Fliers from Hinoka. With both buffs active, Camilla will receive +6 to all stats, with attack essentially counting for double. On Gronnblade+ that results in 30 bonus damage, for a total effective attack power of
78. At that point pretty much everything in this game is going to die in one hit.
Now if you want to maximize and optimize this build further you can consider fun stuff like Iote's Shield on Camilla to proof her against archers, or Death Blow just to make extra sure everything dies. You might consider Green Tomebreaker although I don't really think she needs it.
Also Caeda is a bad unit, but you need Fortify Fliers. Ideally you'd pass that skill on to, well, I guess Palla is the only other flying red at the moment.
To round out your defense team throw in a Cherche with Brave Axe+ and Goad Fliers, which stacks on top of everything else (but doesn't count on Gronnblade).
Proceed to wreak havoc. It's not Nino Kuni without Nino, so for now I'm calling this build the Bunny 'Hood.