C.B.
I agree with the ones that say it is normal. Happened to my oldest. Just have her start wiggling the tooth in front of it to get that one to loosen and fall out.
When dd finally lost her tooth, she was visiting her grandparents. When we picked her up 2 days later, the adult tooth had already moved into place so we never got to see her with her first missing tooth. Oh, and the adult tooth did not grow in crooked.