Coaches who work with young children probably have seen how even a few months could make a huge difference in children's development and drive so I very much doubt that your DD is in any bins.
I'm sure private music lessons are expensive in your area too but if your DD is sticking to piano, sooner or later, she'd need private lessons and I think sooner is often better than later if she is going to transfer to a different teacher down the road.
A good piano teacher who has worked with a number of highly talented students and he/she could be a wonderful source of support for your DD and for you. I'm learning so much from her piano teacher who has been teaching at a GT school for many years. She really gets DD's personality, temperament, asynchrony, stubbornness, and her need to explore on her own while still needing instruction. It's always hard to part with a good teacher especially if your child has bonded with her but sometimes, it's necessary.
