I can only speak from my own experience, but DD enjoyed preschool at 2 1/2. Not so much for academics since she knew her colors, shapes etc. but she enjoyed the social aspect since she was an only child.
Since you are a SAHM, you can pursue her interests as home. If she has a particular interest in a topic, go to the library and pick up books about that topic. DD loved animals and around 3 she only wanted books about snakes and spiders (yuck!!!) that I read to her. Animals and nature is still her passion and it was obvious from early on.
You can also explain math concepts and see how she responds and picks them up. I usually didn't initiate much of this, just waited until DD asked a question and explained it to her. Following a child's lead will avoid the pushiness and she is likely to ask more questions.
Get ready for an interesting ride, you children sound very bright.
Jen
