AITA for telling my friend that my sister was talking shit about her?
I (18F) have worked with my sister (18F) at a retail store for 2 years. For some background, my sister and I work on separate days, except on Fridays and Saturdays, and because of this, we have formed close relationships with the girls we work with on our days we work. About a year ago, we got a new hire, Elise (17F), who went to a different school than my sister and I. Elise and I quickly formed a good friendship because she worked the same days I did, and we just had similar personalities and ideas on how we'd raise our future kids, and us not having the best mental health. She eventually met my sister, and they, too, began to be close. But around the end of March, there were issues. My sister began to talk about some of the things Elise did that she didn't agree with, mainly her love life, which I agree with on some aspects, but I didn't really care, not my life or my issue. But on a Friday, while my sister and I were driving to work, she brought up Elise's love life. Talking about how she kept going back to the same guy, even though he'd hurt her and left, or how she'd "have a new guy every week" (which isn't fully wrong, but she made it sound like she was sleeping with them when she wasn't, just talking). I agreed with some of my sister's points and didn't fully state the ones I didn't agree with, BAD IDEA. Into that shift, my sister and I were working together, while Elise wasn't even a yard away, and my sister began to shit-talk her. Saying how her taste in guys was bad, which I agree with, but then saying other things, like how she was getting paid by our boss for feeding our boss's animals, (which ended up being not true). I was under the impression, from my sister, that the payment was true; the issue at the time was that my sister and I wanted a raise, but weren't getting one, even though we've been there for two years. But the thing that made me realize she was just shit-talking was when she called Elise a pick-me. This whole time, I didn't feel comfortable talking about Elise when Elise wasn't far away from us, so I nodded my head a lot or just said things like "yeah" or "I guess". In short, Elise heard everything and was sad and mad. Later that night, I deeply apologized to Elise, and after a gift basket I made her and some talking, we became friends again, deeper than ever. Elise and my sister haven't talked since my sister sent a text to Elise apologizing, but didn't apologize for the hurtful things she said to Elise. But the issue comes from my sister being mad at me for being friends with Elise, and Elise never answering my sister's text. Am I the asshole?