Why does she want me to do this?

Right I started talking to this girl (let's call her Lizzie) who I'm pretty sure likes me but she says she doesn't but I think she is being shy. Then I started talking to one of her friends (let's call her Vicky) and then we were talking through skype video chat. Then Lizzie joined in and we all started talking. Lizzie left so it was just me and Vicky. I went to go and have a shower then I came back and I was trying to find some pjs but I could only find bottoms. I then sed I can't put webcam on cause I don't have a top. Then she kept saying put it on. I then asked Vicky and Lizzie later and they both sed because it's funny. Why did she want me to do that. I'm 13 they are both 13 sorry it's so long