Potty?

I hate to even post this, but Isabel has gone potty on the big girl potty 3 times! Two pees and a poop. I just sit her on and she does her stuff and gives me a look like "what, isn't this what you're supposed to do?" Of course this means that if I actually want her potty trained I have to actually potty train her. I've read that if you do it too early the kiddos usually revert back to diapers and rebel, so I'm not sure I should. Besides that, when you go hard core you usually have to stay home all.the.time until they get it. Humm....not sure what to do.