Between a rock and a hard place

While my MIL is not intentionally vindictive, she has made things very uncomfortable this pregnancy. It's to the point where my husband and I are seriously questioning her mental state. Over the last few months, we keep bumping in to people who either ask about some story MIL made up or know very private information about my pregnancy because MIL likes to brag about stupid things. My FIL is a saint at this point. While pregnant with my son, she was a horrid overbearing twit who was clearly convinced that her son produced a clone and that I was an incubator. We got over it, set up boundaries, refused to take her calls after a few months. Husband grew up quickly and realized Mommy is not normal and is best kept at arm's length. This pregnancy all boundaries are now out the window. To complicate matters, she exposed our son to her cold sores by intentionally giving him her shake while having an outbreak. I still want to murder her over that. I shouldn't have to explain how herpes works to a 55 year old. MIL has completely overstepped all set boundaries since we bought their old house at a discount ( not that great since the house was infested with mice and needs a ton of work to bring back to its former glory) and now thinks we owe her. She has demanded we name my baby after her mother (who wasn't a great mom or grandma to begin with) and told my husband they wouldn't forgive him if he didn't oblige. I'm still angry about that. I've already told Husband neither woman is allowed at the birth and he is not to tell them when I give birth. I know psycho and her mother will try to come to our house uninvited afterwards and try to kiss on my newborn with herpes. I just needed to vent. Thanks.