She Triggers It

My son has a stepmom. At first I tried to be her friend but like myself she has a lot of problems. She is determined to make me out to be a bad mom and I'm not. I love my child and always put him first. But somethings have changed and she attacks for everything little thing if something happens with my child. I'm not perfect but how am I suppose to co parent with someone who is being petty for me calling her out and standing up for myself. She mentally drains me and makes me feel like I know longer want to be on this earth anymore. No, of course I won't do anything. I'm not going to leave my son like that but I don't know what to do. She triggers so much to where I get sick because I overthink and have an obsession personality. I don't wanna leave my son. I don't want to have these thoughts but I don't know how much longer I can deal with all this.