Hi M. -
I would let her do it on her own like one of the other mothers said. I was probably a bit more lax (or lazy) on the potty training, and let my kids tell me when they were ready. They were both 3 1/2 years old when they were potty trained, and only took 2 days. I never had to tell them to go to the potty, they just went because their bodies were developed enough to tell them that they had to go.
Both my son and daughter have gone without diapers/pull ups at night two months after they were potty trained, and in a year and a half I have only had 2 accidents w/ my daughter and in 7 months with my son, only one.
Also, every child is different.
Good luck!