A.H.
Most do not accomplish this until later and it's impressive it worked with your son - especially if you did not have any setbacks later when he started school.
All children are different, so you really should not base what your son did with what she can do. Sometimes, I feel parents rush into this too quickly and it was funny that my pediatrician even agreed with me.
I would keep it up, but only if she leads it~ this is HER dance... Do not punish her if she has an accident. Her body is not ready to fully handle this yet.