We have a fair amount of LeapFrog toys that were given to us as gifts (I'm not a huge fan of them... but that's more because I think they play on parent's fear like Baby Einstein toys... that's another issue altogether).
For a long time we used to play a puzzle game where I would "think of a number between 1 and 100. This number is even. This number is a square. This number is..." etc. That sort of thing. The other huge hit in our house is bathroom crayons. Both boys like to do "math" in the bath tub.
At any rate, I would only consider it hot housing if you're requiring your DD to do it versus making it available to her if she's interested. There have been plenty of times when I'd get something I thought DS would really dig just to find that he's not interested.
JB