Am I Petty?

Ok ladies I've previously posted about my MIL before my son was born. My fiance & I had many issues with her, some being her threatening to "beat my ass" & have her sister punch me in the stomach while I was 5 months pregnant. So we moved 14 hours away, haven't talked to her or anything. Fast forward to now.. my son is 6 months old & my fiance started talking to his mom on Thanksgiving. Cool right? I don't really care because truthfully I messaged her a few weeks prior & told her to step up & be a mother to her son. So I guess she took my advice. Still has me blocked, I'm more than positive she still talks shit to him about me because he always has to go outside to talk with her on the phone. Once again, I don't care. She's not my mom so it doesnt matter to me. However, I go on my fiances Facebook because he doesnt have a phone as of right now so uses mine & I see her profile picture is my son. The kind of bothers me because of the fact that she pretty much threatened to have my son killed while I was pregnant with him. Back when all that stuff happened, I told my fiance she is NOT to meet him until I get a SINCERE apology. until then, she will have nothing to do with him. Well now that their talking again, he seems to act as if shes just going to get to meet my son.. HA HA HA. Ive reminded him of the circumstances & he just walks away. He told me shes going to visit in February & I told him she's not staying in my house nor is she meeting our son since I STILL haven't gotten an apology. I know he gets upset & I feel bad but I'm not going to bow down to her. She caused me so many issues while I was pregnant & I mean there's just some stuff you don't do. Threatening your sons pregnant fiance is definitely one of them. Anyways, I just want some other opinions... is this wrong of me to do?