DD (7) came home today after a holiday camp saying she had a secret she couldn't tell else she'd be beaten up. We've had a chat and I said that there shouldn't be any secrets from me and if someone threatens you like that it's a sign that she should tell an adult. She said she would tell me as long as I didn't tell DS or anyone else. We've also talked about secrets vs surprises and she should always tell me or DH if someone tells her to keep a secret.
The secret is that D's brother, one of the big kids, has kissed L and his mother mustn't find out because she will be very, very angry.
L is a girl that DD did a club with last summer term and happens to be in same holiday club. I know she is in the same class (diff school) as DD so must be aged 6-7. She's a bit of a wild child, kind at heart but unruly. I spoke to her mum a couple of times last summer, but she kept herself to herself. She's much younger than all of the other parents, so must have had L as a young teenager. I felt a bit sorry for L the other day as she introduced one of the older kids as her half brother and he laughed at her and said, "no I'm not" so she asked what he was then and he said "your uncle!"
She clearly lives with her grandparents. I had a chat with her grandmother the other day and we were talking about our kids, turns out L is suspected ADHD (one of mine is too).
Back to the issue, the boy in question is, DD thinks, in DS's group which would put him in the 9-11 age range. DD says the boy asked L if she wanted to kiss and L said yes. So we had a chat about saying no if your not comfortable etc (not what I thought I'd be talking about to my 7 year old this afternoon) and DD said maybe L thought she would be beaten up if she said no 
So.... I feel really uncomfortable about all of this. She's really young. I know mine with ADHD is very socially naive, but this could also be his ASD. Am I over reacting? Should I try and say something to one of her family? I could probably find her grandmother online as I know her name/job. I know who her grandfather is (he ran the club they did together). I might see her mum tomorrow at pick up. Mind my own. business?