Who is the appropriate person to tell Update2

I babysit an 8 year old who I accidentally walked in on masturbating. Now I found out that's normal for children, but... For the last month she's been doing weird stuff. She has a bar lie head that you do hair on and she will grind her against her privates. I told her not to do that and she said Barbie is supposed to lick down there and it feels nice. Normally would tell the mother but there is no mother. Her father hired me. He does have a girlfriend but she's only been there a month so I don't think that would be appropriate.

Edit: Shit I never even thought about them thinking I did something to her!

Update: So her father works tonight and I went over there to babysit but ask to speak to him and told him what I told you. He looked.disturbed.. He got her tablet to see if the parental lock is still on. Then he went to talk to her. He asked about what she did and where did she learn it from and she said "It's a secret". He said " We don't keep secrets. Where did you learn that?" She just kept saying its a secret so he said he's gonna take her to see a child psychologist. He's called in and thanked me for telling him.

Update: I spoke to the dad earlier. Sorry forgot to update. He took her to.the psychologicalist and said they were there for a few hours. He said he's taking a few days off work because now they know what happened and who did what and police aren't involved. He said he won't need me but I can come over to visit her of I want. When I asked who I was he said he will tell me later. He needs time to process everything.