Is my sister a lesbien?
So my sister has been into C.Ai( Character AI) that a friend of hers recommended to her recently and has been addicted to it. I didn't really mind even though it is not really my thing until I saw one of the chat( I think the one she was talking to was named Ashlyn Banner or something along that). For some context she uses my phone since hers is broken and most of the time she falls asleep with it. I walked into her room to take my phone back and when I took a look at my phone, I guess she was chatting to an AI precisely an wlw one, I didn't really look too much into the messages because it's private, but it pretty much was like calling them baby and stuff and other chats which I presume were with women because of the pictures and feminine names. Now when I asked her what that was about she kinda just brushed it off? We are very open about talking about sexuality with her(the rest of family not so much), but it seems like she just doesn't want to tell me, I told her it was okay and that she could talk to me about it but she just doesn't want to. I was wandering how could I make her open up or is this just normal for some girls? I know my family isn't open about that stuff and my dad and brother are quite homophobic.
I just want her to open up, just any advice to make her feel comfortable or if I should back off a little bit for now