I would mostly concur with the recommendations people above have already said. My personal favourites that I think would be great for a kid also would be Island Living, then Cottage Living, then Snowy Escape. (For the BIG packs)
The medium packs, Realm of Magic would be great for kids I think. Alot of (literally) awesome fantasy type stuff in it. The duels are mainly for fun.
Since she has parenting already, getting the Kids room Stuff and/or Toddler Stuff (For the small packs)
Probably may want to avoid Vampires and Werewolves. Vampires especially can be creepy and disturbing. Being 'assaulted' by blood-sucking vampires. Or bitten and all that. ;)
Oh, for kit packs, stay away from Bust the Dust. It forces you to have to vacuum or whatever everywhere constantly. It can be a game-breaker.
If she really wants to do vacuuming and sweeping, get her to have fun doing that in your real home, heh heh! ;) :D