I have my daughter under my profile and she created one today herself and linked her park passes in it. Can I merge them? Can I just link them in profile under my name?
If she was under you as a child, and now has created her own account with a new email, she (or you) will have to call the number on the MDE help page and an IT person can delete one. You can ask about the merging of info that remains (tix, etc.)
ETA: and then yes, you will have to send her a Friends and Family invite, that she would accept. But you would no longer have "control" over her new account.
Dreams Unlimited Travel is committed to providing you with the very best vacation planning experience possible. Our Vacation Planners are experts and will share their honest advice to help you have a magical vacation.