Step kids..

So I got with a man who has 4 children from 4 other women. Yes I know sounds horrible but it happens. None of them he regrets and I totally get it. ANYWHO, well we see his oldest every weekend who is a 13 year old girl. Good kid but we worry sometimes. Her mom is very open with her about how many sex partners she has and has filled her poor head with “idk he might not be your dad I slept with 8 other people” so she is scared to get to know him. If y’all seen him ALL of his kids has his face. It’s creepy. So there’s no denying it. Well he has been doing everything right by his kids and just wanting to see them. I don’t have a daughter. I have an 8 year old son and I’m trying to be her friend and make her comfortable around me. Well idk if it’s working. She only talks to me if her dads mad at her and today she told him she wasn’t sure it was a good idea to stay the weekend with us cuz she was about to start and he was like ok and? 🤦🏼‍♀️🤦🏼‍♀️🤦🏼‍♀️🤦🏼‍♀️ I messaged her and simply said your dads not understanding what’s going on. Tell me so I can explain it better to him. Well she (like the rest of us bleed Queens) doesn’t want to bleed on herself or her bedding. I simply said well you can do a few things to change that. You can set alarms for every few hours to change it or if you go to bed and bleed then get your belongings put them in the laundry basket and say your gonna take a shower and I’ll see your stuff and when your done we can go wash it. No big deal my son pees a lot so we will just tell him if he asks he needs to wash it cuz he smells bad or something. (Trying to make her feel better) and all she says is ok.. I’m just trying to help. So my thing is am I doing everything right and it’s just gonna take time or does she seem like she just don’t give a damn or what could I do to make her feel somewhat better??? TIA