K.M.
If she stays dry through the night her muscles are definitely developed enough to be trained but that doesn't mean she is mentally ready. You may have to try it and decide if she can handle it.
One thing I learned when training my son is that the parents need to be equally ready to train their kids. It can be frustating so you have to be up to the challenge. Not getting frustrated and anxious about how she is doing will help her succeed.
Once you are ready to train her stay ahead of her wetting her diaper/pants by telling (not asking) her to sit on the potty.
Good luck!