My grandmother in law makes my blood boil but she has dementia…

This sounds really bad but I really need advice. SORRY THIS POST IS LONG. Me (f 22)and my fiancé (m30)rented a house recently and told his grandmother in law ( call her A) to come stay with us because his family couldn’t put her in a home plus she was getting kicked out of her house. She also has either stage one or stage 2 dementia. Whatever stage she’s in it’s the one where she’s just getting pissed off at everything and everyone. Few examples I have a 1 and 2 year old, they are loud normal toddlers doing what toddlers do play, run, crying tantrums. Well she doesn’t like all the noise and for some reason instead of going to her room which is on the other side of the house she stays in the living room which is right next to our room and you can hear everything she stays on the living room all day long. Then she complains about how loud they are and how they are bad kids who don’t listen. She also favors my youngest son over my oldest son and will scold my oldest for being loud or misbehaving and turn right around to my youngest and tell him how sweet he is and gives him hugs, kisses,etc. she will also complain about just about everything under the son while repeatedly telling me stuff over and over which I know isn’t her fault but it’s exhausting. Plus we had2 huskies one female and one male. She would get so pissed off about my male husky getting up to stretch his legs to walk around the house and she would get pissed and try to run him over with her walker. We were worried she was going to hurt him or “accidentally” let him out the front door( which she has had a history of doing stuff like this to dogs and cats of other family members) he gave him to a good home. Now today I had reached my limit. I work part time, but I work just about every single day and when I get home, I wanna relax see my kids enjoy my evening, but I can’t do that with her doing all of this so when I get home today from work. She’s already complaining about how loud my boys have been how annoying they’ve been how annoying my female Husky has been stuff like that. well I had to stop by after work at my fiancé’s work and they were having adoption dog day for dogs who if they don’t get adopted today, they will be put down so he wanted this one dog. It was his dream dog. She is beautiful. She’s so sweet kind hearted so I walk in with her and she gets so pissed asking if that dog is staying how long are we keeping it that sort of thing I tell her that I got the dog for my fiancé for Christmas and it’s for him it’s gonna be his dog and then I go into my room where my kids are while I come back out and she is fuming so I go to the kitchen make my kids some snacks and the entire time while they are eating she is nitpicking at everything my oldest is doing how he’s eating if he says one word she’s telling him to shut up and eat his food. She then tells my that my new dog is sick and she doesn’t know what I’m going to do with it. I told her that the adoption place has already given her updated shots and chipped and she’s been seen by a vet. She told me they lied to me bc she used to breed huskies. I simply told her that’s just what the adoption place told me. She then says that she must be stupid and doesn’t know what she’s talking about just like her couch set got “ruined” by dogs. That just set me off and I walked out. Idk what to do anymore. Plus with my kids in my mind that is my child. These are my children. If I think they’re doing something wrong, I can get onto them. I don’t need someone else. Who’s not the mother or the father to be telling my kids what to do how to do it. That is my biggest pet peeve Is people telling me how to raise my kids what to do with my kids or trying to tell my kids what to do. So much happens every day I am mentally and physically and emotionally exhausted especially having to work cook dinner for 5 people and have time with my kids. Honestly I don’t know what to do. MY husband gets tired of her “ tattle telling on my kids to my husband, like I’m not another parent and he tired of hearing her get hurt feelings hurt when I try to have a convo with her like I did today with the dog. Idk if i’m doing something wrong or what but if anyone has advice, please please let me know how to handle all of this so sorry this post is so long.