S.L.
From my experience you can't just let the child decide when to go on their own or not but you have to take charge and say we are going to sit on the potty now. Take her and see that she sits on it and go again in about 15-30 min. I set a timer and when it went off the child knew to go sit on it. Reset the timer and keep going until there are no accidents and she is going all day and the next and the next, etc. It takes a lot more work on your part than on hers. It sounds like she is ready and if she is waking up dry and shows interest I would start her now.