So I (Female teenager, prefer not to say age), have this friend (same age as me, F) who I've known since we were both just babies. She has an older sister (18F) who she doesn't like that much. They're constantly getting into fights, and my friend is always coming to me and another friend (same age as us, F) for support. Now, obviously, me and friend B will always comfort friend A.

I do taekwondo, and friend A's sister joined back at the start of this year after not going for a few years due to medical reasons. But she wanted to join back, so she did.

I already had a few friends there, as well as my girlfriend, and us as a group decided to welcome friend A's sister into the friend group. We all got along really well, and when taekwondo was over I messaged friend A saying "Hey, I think your sister is starting to join the friend group at taekwondo. Is that okay by you?" and she was like "yeah, that's fine, dw about it".

So, friend A's sister is now in the friend group, and things are going great. No dramas with friend A, her sister, anyone. Everyone is fine.

But, I was on call with friend A and friend B earlier today, and friend A said she was going to start distancing herself from anyone who was friends with her sister. I asked if that included me as well, and she said it was "up to me". I was really confused by this, so I asked what she meant, to which she didn't respond. I repeat the question-still no response.

So I leave the call, but friend A and friend B keep trying to call.

I keep declining the calls because I knew that if I were to join I would say something stupid. So, instead I message "I thought friend A wanted to distance herself from me?" Now, I know that was a bit dramatic, but I was in a bad mood. Friend A was like "no not like that" and I asked what she meant. She said she wanted to distance herself "mentally not physically". Idk if I'm just dumb, but I had no clue what that meant. Then she added another message saying "I didn't say that just about you though". I said that she said she was distancing herself from anyone who was friends with her sister. She admits she did say that, so I asked what her point was. So then friend A was like "I feel like whenever my sister does something you always make an excuse for it. You said you aren't excusing what she's done to you but it feels like you are." I tell her that that isn't what I'm trying to do at all. There's a bit more back and forth kind of similar to that, which I won't bore you with reading because it isn't all that important.

Long story short, I apologised to friend A, and thought that was the end of it. But then she told me to put myself in her shoes. She didn't explain any further and went offline. So I sent a bunch of messages trying to explain further, to which she didn't open until about five minutes after I sent them. I sent another message asking what she meant by "put myself in her shoes", to which she said "Answer my question on if you've thought about everything before I answer yours". So, I say that I have, and still stand by what I said. I ask her to give me her side of things, to which she said she needs time to think about.

She hasn't said anything further, so I would just like some second opinions on the situation and if I'm being a bitchy friend or not. So, AITAH?