It sounds to me that she is looking for attention. Maybe she isn't used to having another female in the house and it is driving her crazy. (kind of like when you have a girl dog for a while and then you get another girl dog and they don't get along because the first one is kind of like 'i was here first, this is MY house and now MY family is giving YOU attention?) I am five months pregnant and i had to go stay with my fiance's grandma for a little while. She acted the same way. I just thought maybe it was because she lived 4 hours away from her grandson (my fiance) and when he finally came to "visit", he was spending so much time with ME and not HER.
one time she actually came in and turned on all the lights in the room i was sleeping in, saying she was looking for something. at like 8am.there were 2 lamps, but nooo, she needed to let the sunlight in, and have the main light on, AND the lamps, because "shes old and her eyes are bad". when i had been up all night and then got like 4 hours of sleep, to wake up to this, i wasn't very happy. my boyfriend pointed out to her that this was kind of a rude wake up call, and she just said "so what? all she does is sleep all day anyways. she just lays in bed. doesnt have anywhere to be." coincidentally after that i could not go to sleep.
you should try writing out a letter to your in laws (specifically his mother), because some things you just have a hard time saying in person, and you might forget something if you talk in person, and you also can't erase something and start over. tell her how you are feeling that she is trying to get attention and maybe she is feeling a little bit alone because another female is in the house (try to say that as nice as possible! when someone says to a woman that they are looking for attention it almost never ends nicely.) you should tell her everything you said in this post, and explain to her how you are feeling.
Also, you should add in there that you all had already come upon a given rent and now they are changing it when you are five months pregnant, and that isn't really fair or reasonable. And if I were you, I would add something like this in that letter as well.. "I am five months pregnant. Me and my husband can not afford to live in our own place, how do you expect us to do that when the baby is here if you keep taking our money? we should be saving up for our baby so that we can move out of here when my baby is born, because i don't really want to raise a child in my husband's parent's basement. my baby should be able to have his or her own room or at least his or her own living room. a basement is not a great place to raise a child. i feel like we should be saving our money instead of giving it to you for rent, because then how the hell are we going to move out of here? if we didn't have money for our own place, what makes you think we would have money to give you $600 a month AND buy diapers and everything else a baby needs? as parents you should be trying to make this easier on your son and me, not harder, and the emotional things and stress this is causing are very bad. stress can kill my baby."
And it can kill your baby, so watch out! (although it's pretty unlikley, unless you are stresssssed out to the MAX!
and if that doesn't work, maybe just stay in the basement 24/7? i know it's not the ideal choice to have to be cooped up all day but at least you won't have to talk to your mother in law and deal with her crazyness. also you can try reading and being online or watching TV. if you arent around your mother in law then i'm sure you won't be stressed out that much, and maybe she will even notice your absence and think about what caused you to become such a hermit crab, hiding in your little shell! and she might even feel bad. she might even apologize.
And if that doesn't work, try talking to your husband's dad. maybe he can talk to his wife. i'm sure if anyone in the WORLD knows anything about this woman and how she can act, it would be him.
you can email me if you want to :) if you need any more advice or just need a friend to talk to.
i hope my advice helped you.
5 months pregnant and i HAAATE my inlaws.