Sorry for the long post, but i need some opinions!

So i just found out today that my SO sister doesn’t like me. We’ve been together for 8 months now, we’ve known eachother 11 years. They’ve never had a close relationship to begin with. She smiles in my face and has never given any hint that she doesn’t like me. Ever since her and her girlfriend just broke up, she calls my SO more often and apparently keeps saying things to their mother about how I don’t push him to do better. I try my hardest. He put his 2 week notice in at his old job because he was miserable there and I encouraged him to do something about it so he wasn’t miserable anymore and that’s when he decided to put in his notice. Her and I encouraged him to apply where she works because it was a good job (this is her 4th or 5th job this year)

but he didn’t pass the personality quiz. He’s applied to multiple staffing agencies and none has a 1st shift position he is looking for. He recently started doing paid under the table roofing jobs for an ex amish man. He enjoys it. I encouraged it because of him enjoying it. I want him happy at the place he works. Yes it is seasonal and we haven’t come up with a plan for the winter months but he’s happy where he is and we are getting by just fine. I fee like since her relationship ended, so she’s trying to turn his family against me by saying these bad things and she’s been making up lies about me and who i’ve dated, she tried to tell his mom that i dated one of his best friends before and now it’s messed up that i moved on to him (which I don’t even know the dude she’s talking bout).

Any ladies deal with a relative like this? I’m very easy to get along woth, I don’t start drama at all. I’ve always gotten along woth his mom, never had a problem withher or the sister. I’m just confused as to how to handle all this.