Under HIPAA I think she has 30 days from receipt of your request to respond, either with your records or with an explanation why she thinks you shouldn't have them. (Which I think can be appealed to her licensing board.)

She doesn't have to give you her "psychotherapy notes," but she does have to explain why.

You don't need a lawyer. If she ignores you can report her to the Department of Health and Human Services, which oversees HIPAA.

This is of course not official legal advice, just based on my own experiences.