I agree. There's no harm in seeking an opinion from a health professional. Just a regular gp would be a start.

There are things like Early Intervention. Weather there is something there or not, they can help. Even just little things like helping her deal with social situations.

DS was very much like your DD when it came to others touching him. He'd freeze & cry. So we avoided it if it was possible. He still struggles now with adults outside the immediate family, but he's getting there. Very slowly.

She's your daughter. Only you really know her. She has been through a lot, but that's no reason to ignore your gut instinct.

Good luck