Please offer your advice, I could really use it?

Record her saying anything mean to you? You need to get some proof that she is a mean person, like maybe a video or something.When she starts crying, Ignore the croc tears when you call her out on something, or you can start fake crying before she does. If she says something to you, you be mean to her back, then lie about it to your husband. Steal attention away from her to piss her off (Since she is an attention ). And if nothing works, try avoiding her and not talking to her, you won't get mad.