How can i make things right and back to how it was before?

Last year I kinda said something rude online indirectly about my stepmom although she didn't do anything wrong at all but I've been going through alot and my step sisters found out and made a big deal we faught and we drifted apart for a couple of weeks maybe a month or 2 and I apologized to my stepmom and I apologized to my stepsister but for both my step mom and sister the apology was more like "sorry" and leave. Months later we I faught with my mom and I needed a doctors appointment so I had no one but my stepmom and I guess from the apointment thing till now the relationship between me and my stepmom is really good we started to get close and stuff and she started to take care of me but it wasn't like before and my stepsister was more like being nice to be because like family is around and like when I ask her to hang out she's always busy , when I add her she decline my request , she keeps blocking me everywhere and I really miss her and its been a year now and she doesn't want me around and I don't know what's wrong with her. And when I ask her for her phone number she gives me a fake one and I don't want to pressure her but I miss her and I want her and I understand that her was is very important to her and I feel super guilty and I don't know what to do? I need help ...! She's like the only sister I have I don't have any.