[FONT=""][COLOR=""][SIZE=""]IMO, certainly she's mentally disturbed in some way, judging by how it sounds in your post.

as for if it's sexual, there's no way of knowing honestly, but even if it were, certain fetishes can and do often correlate to underlying mental health issues, so theyre not mutually exclusive. So in any case she probably needs some kind of help from a professional.

What I'm worried about is the mother, who's probably just making the situation worse by affirming the daughter's fantasy by treating her like a child. She probably means well/doesn't know how else to handle the situation, but yeah it's not helping.

Im wondering if this is maaaybe a case for CPS tbh. But that's not your responsibility, somebody else who knows the situation better can make that call[/size][/color][/font]