Grandparents rights?

Bare with me, this could be long.

So about 4 years ago, my in laws divorce got real messy. My SO has never had the best relationship with his mother. She was abusive both mentally and physically. Nothing was ever done about it, childrens services have been involved, police called from neighbours. She puts on a good show. My SO moved out at 16. The older he became, he started to have a relationship with her again. We would go for holidays, visits, day outings etc. Well when the divorce went sideways she was dragging my SO and SIL into it. Both being late 20s and had whatever say they wanted, both told them it was between the parents, they didnt need to be involved. Keep in mind at this time we were still actively seeing and talking to both parents. One day she called my fiance after a 12 hour shift, and started yelling at him about the house and his dad and whatever. He decided that was enough. She gave up the key to the house so it could be dealt with (she lived in it for months and never payed the mortgage) we went to pick it up and then never seen or talked to her again. I was 9 weeks pregnant, nobody knew at the time.

Every once in a while she would send a holiday text. Or a text freaking out about something. Shes super manipulative and it wasnt worth the hassle. Fast forward to like 2 month ago. The divorce is almost finalized. She for whatever reason has my SOs life insurance policy in her name still. She wants half my fILs pension. He said she can have it, but he wants the insurance to be given to us. He knows we dont want her knowing where we live, so he said he will take care of the paper work and used his address but put my name on it. She messaged us asking for our address. We told her that since my FIL was taking care of it, she didnt need it. She said she wasnt signing over "incomplete" paper work. Then LOST it talking about taking us to court to see our son. Now we stopped talking to her at 9 weeks pregnant my son is now 2.5. she has never met him. The only time she would have even seen pictures or known about the pregnancy is through other family members. I know in my area grandparents rights are a thing, but its usually in the case of suddenly taking away the grandchild from them, if they spent alot of time with them. So right before all this covid-19 stuff we have had 2 different neighbours tell us they were buzzed from the front door of our apartment building, and asked for us or if they knew us. We just moved here in January. new town and all so we know nobody. And anyone we talk to on the regular would call us directly. I also had a call from the front intercom that I missed but a message was left of 2 people talking to each other but couldn't make it out. All these calls were within 1.5 weeks. So every few days.do you think it's possible that either she hired an investigator to find out where we are (shes legit that crazy) or is trying to serve us court papers? We have number 2 coming tomorrow, its stressing me out. Shes been trying to call us as well. Talking to her makes it worse, the last messages we had were a disaster and my SO said he doesn't want to hear from her again. But what are the chances of a grandparent who has never met their grandchild for good reason, getting rights? Shes toxic. My SO said he will go as far as seeing if he can get childrens aid/police reports if needed.