Please wait. When she gets "into it", she will want it above all else. It gets a bit addictive. Instead, she should be looking at lots of books, working puzzles, Legos, train track, imaginative play. Manipulatives - real things with her hands.
My sons had a friend whose dad bought every known electronic gizmo on the market for his son. He was a techie and he loved it. My kids were very jealous of what this boy had, and I ended up having to get gameboys for them because my older son (2nd grade) became obsessive about others' gameboys. It changed his personality, P.. I know that the obsessive factor was already there, but boy, did it come out with that darn gameboy. He also could not STAND it if he lost his work. If he had a game where you had to get to a place in order to save, and it was time to get off that gameboy, it was a real ordeal because he couldn't stand to let go of it before he was able to save. If I had understood that, I would have refused to buy him ANY game that was like this.
And of course, my youngest had to get to play too - I couldn't give one child a gameboy and not the other.
I admit that though I loved this family, I sometimes wished (when I was going through this) that we hadn't met them until much later because it would have been a lot longer before I allowed them to have gameboys.
That's my opinion.
Dawn