Sounds like you are doing great. It's funny how perceived problems disappear with a little consistent work. My only recommendation would be to stay with it and build on your success over the next few days.
Actually, I don't think this filly has much going against her. I have started several horses that had not been weaned until late. They all broke out nice and made good horses. In fact, I'd rather have a young horse that has not been handled as apposed to a spoiled backyard horse that is a pet (pest).
BTW, I don't think there is anything wrong with your ego. Good luck.