My boyfriends sister 😫

Long story but please read. I am currently 16 weeks and 5 days pregnant with twins. I am also 18 years old. My boyfriends sister has been unsupportive of this pregnancy since the moment she found out. Saying we should "reconsider keeping our child" (back when we thought it was just one). Fast forward to Christmas. We exchanged gifts and got along well. Fast forward again to today. My boyfriend and his brother thought of a last minute road trip to Florida. I asked if I could come to see my grandmother and little sisters who live there and his brother decided I can't go because I'm pregnant. This caused an argument with me and my boyfriend. Siblings talked and his sister decided to make an indirect Facebook status about me. She was being really hateful and its selfish of her to start drama . I am so hormonal and this brought on an hour long crying spell. I am so beyond upset. Below are screenshots of what she said about me. Am I justified in being angry!?! Cuz I'm pissed!!!!