Ok i was walking through the forest and i use fire shout on a deer for teh lulz, then Serana walks over to its corspe and kneels down and puts both her hands on it body.

I know it wasnt a reanimation, since she already had a snow sabre cat reanimated. I had also just taken the pelt and stuff from it, so idk what she was doing.

She was mourning the deer

maybe she is na'vi they did include pandora and narnia in the dlc maybe she just comes from narndora

If that's what I think it is, I've seen NPCs do it with corpses. I think they're checking their inventory - in this case the deer's body. I've only seen it done with humans yet.

Ive only seen children do that to corspes. Ive taken Seran pretty much everywhere but ive only seen her do that with the deer, no people, trolls, goats, dragons, wolves, sabre cats, falmer, giants, just the deer.

I see her doing that sometimes, it's a nice little addition. Serana reanimated a chicken in my save.

oh serana that lovable spaz, I'd guess it's looting, because I've seen evidence in her inventory of her looting items on her own, slightly annoying but nothing I'm unwilling to put up with