Im not sure what to do...

So me and my mother have never really gotten along most of my childhood and adult life. But I live with her due to unfortunate circumstances and I have an 8 month old son. So the other day my son was in the room with his father trying to get put down for bed and we have two dogs that again unfortunately have to be in that room as she won't let them come out, and we have a baby monitor set up, well she hears one of the dogs bark and growl for whatever reason , I'm not sure, but I knew everything was fine because my husband was holding the baby and I can see through the monitor, well she comes running like the house was collapsing, freaking out and I told her everything was fine and to just relax and to stop and it was like a switch flipped. She started telling me to fuck off, don't fucking tell her what to do in her own house, the baby's in that room with two locked up dogs, and just told me to fuck off a few more times, I walked away just to check and I come out and say, honestly when you react that way you have a tendency to make situations worse and she went off again telling me it's her house and she's tired of my shit. Ok. I leave it alone, I'm in the bathroom and she comes out and all I hear is her saying how I'm a fucking bitch , I'm an ungrateful bitch, getting louder and I opened the door and told her to just stop, and she kept going and honestly I told her there was something wrong with her and she told me to shut up , get out by the weekend and slammed her bedroom door. She hasn't spoken to me for a few days, comes home late goes straight to her room and then today while we were out trying to enjoy the day she sends me a bunch of fireball text messages basically telling me how horrible we are and that if we don't get out she will go to the courts.

She has three daughters, I'm the middle her youngest is 19 and lives here too. she's always treated me differently even though the other two have a tendency to treat her less than kind. Youngest does whatever she wants and my mother has always been more friend than mother, and older sister has never been too involved in our family which is a whole different story, but has continuously hurt my mother emotionally yet neither have EVER gotten the treatment that I have. Now I will say I can understand why she was afraid when she heard the dogs however she always has a tendency to over dramatize situations and I finally told her to stop. I wasn't nasty or cruel I just simply said stop. So I know two sides to every story , well this is my side...and what I think hurts me more than us fighting is she won't even come see her grandson...we are in the same house and since this happened she has not even said hi to him...and anytime we have a fight she does this. It's not his fault and I'll be damned if I let her involve him and make him feel a certain way when he's older and can understand better....I can't deal with anymore she goes on these fits where I'm ignored for days sometimes over a week and will not acknowledge him. Me I can deal with, but not towards my son...