You can give them perks in their perk-list that boost stats, but their base-stats do seem pretty low.How do you level up elementals properly? I know they bind to your level, but their arcane and physique don't seem to go up.
Also, is there a way to change their name?
Personally, I gave her a bunch of jewellery with stat-boost enchantments. Didn't want to actually clothe her since she has the exhibitionist trait, but you can still get away with a lot.
An open robe, socks, shoes, bangles, hat. I dunno if she can take piercings or tattoos.