Sister in law problems

Hi ladies! So I just wanna get someone else's point of view on this situation I've been going through.

About a year (in a few months) ago my fiance's sister freaked out on us over "covid" we went to his grandparents house (where she's usually at everyday) and when we walked in it wasn't even 5 minutes and you could definitely tell something was bugging her. She was getting rude and cocky with my fiance and told us we had to leave, she literally threw her 6 month old to her husband who was sitting down and BARELY caught her. So as we were trying to leave I had my son who was almost 2 at the time in my arms going to put my shoes on, we were in the entrance room and it's kinda a tight space, she was about 2 feet from me screaming as loud as she could at my fiance and I told her to stop screaming in front of my child because she was literally scaring him. She told me not to talk to her like that AND PUSHED ME with him in my arms! I tried to move but I wasn't quick enough and she pushed us back making me hitting the washer. After I ran to my shoes and quickly got them on and went outside. After I buckled my son up we got into it but she didn't touch me again.

After all that happened I haven't wanted to see her, be in the same house, I just started this year going back to that house ( my fiances mom lives there and his grandparents live in Florida during winter) so when she's not there I will go there with my fiance to see and visit his mom.

I made so many rules how she wasn't supposed to see him especially with me not around. So when he was there seeing his Nana she couldn't be there.

Right? Or no?

Just lately she's been messaging my fiance telling him she wants to make up with me and give me her things.. have dinner and kinda forget..

But what she's not understanding is I beat my own self up over having my son in that kind of situation, I've cried knowing he could have seriously got hurt.

What should I doo... I hate this women! And she's almost 30 years old.