I am writing a story that involves an adopted girl named Baylee. As of now, she lives in the muggle world with her adoptive parents. Baylee gets her Hogwarts letter and confronts her parents, but they know nothing about it.

Should her parents contact the adoption agency or doing nothing at all?
How would the adoption agency react to such a request of informatioin?
Should the adoption agency give any information about Baylee at all?

Thanks so much for the help! I know it sounds confusing, so if you have any questions, I'll answer them.