My Dd has a friend who I’m about 90% convinced is actually a little boy. They’re best friends and they play here all the time which is fine but they really want to plan a sleepover and I’m not sure. She’s never had a sleepover with a child of the opposite sex before and not sure if I’m just being overly cautious. They’re really sweet little kids and I’m sure all would be fine but I’m just feeling uneasy about it! They’re 9 for reference.