Genuinely how would you respond?!!

Please read the whole thing!! I NEED advice so badly

How do you respond to someone- who you already have a rocky relationship with- when they threaten to never let you see their child ever again??

I haven’t had the best relationship with my SIL for a little over a year. She’s a bitch to put it lightly and I let her walk all over me and I never once stood up for myself until back in December when she called me and screamed at me for an hour straight and then LIED and told her whole family it was ME that was screaming at her, when I couldn’t even get a single word in the entire phone call because she kept cutting me off.

She told all of her friends the same lie as well and they specifically reached out to me and told me they knew she was lying through her teeth because I am literally the most quiet pushover there is.

Now that her and I are on very limited speaking terms, she’s now treating the rest of her family (parents and siblings) the way she used to treat me back when we talked… everyone is sick of it and at one point my husbands mom got pissed and told her to sit the fuck down and told her off because of how awful she was treating everyone.

She threatened to never let anyone see her kid again and now because of that, my husbands mom is basically kissing her ass because she doesn’t want to have her very first grand child taken from her… the worst part is that she would 10000% do it too because her husbands parents have absolutely no relationship with her child whatsoever because they got into a minor argument about money (they use to pay for everything for them-rent, car insurance, food etc.) and my SIL blocked them on all social media, her husbands phone- literally everything and is refusing to let him have a relationship with them. They’ve met her ONE time in her whole 2 years of life and communicate through email only because they won’t allow them to see them… they even moved and didn’t update them on their address… and again, this was all because they told them that they needed to be more financially responsible for themselves because they are married with a child now

So needless to say she will 100% take her child away from all of us if she doesn’t get her way on EVERYTHING.

I personally don’t come around to my husbands family gathers very much for multiple reasons.. I work 55+ hours a week so I’m BUSY but also being around them causes me an insane amount of anxiety because of what happened a few months ago… because of that, my SIL has started to throw out comments specifically about me saying that if I’m not around then I might as well not have a relationship with her child (meaning she’s threatening for me specifically to not be aloud to see her)…. I see this as completely irrational and manipulative because I have never, ever, ever done anything unsafe, uncaring, or harmful to her child… actually none of us have!! But she keeps using her child as a pawn in her relationship with all of us and I’m so tired of it!!!! I don’t wanna be like my MIL and have to kiss her ass just so she keeps her child in my life. That’s not worth my mental health

GENUINELY how would you respond????? Like specifically what would you say to a person like this??