J.S.
She'll do it when she's ready. I have 3 girls and they all were potty trained around age 3 1/2. I've known kids who weren't trained until just before they entered Kindergarten. It all depends on the kid.
Do not push this issue. It will become a matter of control and your child will win. You can suggest using the toilet, but if she isn't interested, try again in a few months. Go to the library and read a few books on the subject to get some perspective.