Family Sharing issue with incorrect birthdate on Apple Account

My daughter’s birthdate on her Apple ID was incorrect which turned her account into an adult role in Family Sharing which took away my parental controls for screen time. She logged into her Apple ID and corrected her birthdate but it still showed her as an adult on my phone so I removed her from family sharing. I added her again and sent the invitation but when she clicks accept it says she’s already part of my family sharing. PLEASE HELP! Thank you.

[Re-Titled by Moderator]