I was going to suggest
Capsela but, sadly, it looks like it's not being made any more.
Take a look at that Amazon link though, and check out the 'Customers Who Viewed This Item Also Viewed' list. It looks like a good bunch of stuff that's fun enough that she won't even realise they're educational.
EDIT: I would have loved the Snap Circuits stuff as a kid.
http://www.amazon.com/Elenco-SCROV-1...ref=pd_sim_t_3
http://www.amazon.com/Elenco-Electro...ref=pd_sim_t_1
http://www.amazon.com/Elenco-SC-500-...ref=pd_sbs_t_4