How do you all deal with the

Overly bitchy sister-in-law. Let me explain she’s not truly a sister in law. I’ve been with my boyfriend for 7 years, and I’m referring to his little brothers “fiancé” (they been together for 3 years but we’re engaged after not even 1). Anyways she’s being so bitchy and judgmental towards my decisions. I haven’t made the BEST decisions since I’ve been pregnant but I do the best I can. I’m not here for comments on how I can be better and exactly what the argument was about. But what I can’t stand is that she won’t say a word to me, but has the audacity to post about it on social media. I called her out for it this time, telling her a conversation or a text would’ve been perceived better. Her attitude and bitchiness just pushed me over the edge though. I have NO idea how to handle her. Not sure if it’s the fact that she’s 5 years younger than me or she thinks she knows better, but I was seconds away from punching her in the face and I know that’s not the best option. Also side note, I’m far from being an angry or violent person 😂 she just makes my skin crawl.