Sister in laws

How do you ladies deal with your hubbies sisters? I can’t stand my mans sister after some dumb shit she did to me and then doesn’t even apologize directly to me, but to my man instead. It was also some fucking half ass apology, just making excuses for her dumb behavior. I want to get over it, but when I see her she doesn’t want to make eye contact with me and it irritates me even more. She is a grown ass woman too. I just don’t understand some people not owning up to their mistakes.