I know this sounds childish but does it seem like she’s being petty?

I recently decided to stop being friends with someone- I didn’t like the way she treated me or talked to me. She would talk down on me constantly. She’s Has 30+ friends and has to be the center of attention. We have a mutual friend (Sasha) and Sasha was also getting annoyed with the way she treated her and she would NEVER make time to hangout with us or would cancel. Now that we aren’t friends anymore she constantly makes plans with Sasha- makes it hard for me to make plans with her too. I feel like she’s trying to fill up her time so much that I can’t make plans. Shes the type that if you tell her no to plans or make plans with someone she doesn’t like, she gets passive aggressive. when me and Sasha do make plans she’s constantly texting her saying “are you hanging out with *****.” Last time she didn’t text back because we were swimming and she text her multiple times asking her why she isn’t answering her question and if she is with me. I feel like she is only making so many plans with sasha all of a sudden to spite me. She is allowed to hangout with whoever she wants but it’s just convenient now that we aren’t friends, she wants to spend so much time with Sasha. She’s also putting rumors around that she dropped me as a friend because I couldn’t “communicate” with her and that I don’t know how to be a friend. Im the one that told her I didn’t want to be friends, she never dropped me so she is lying. It’s all so childish and I know all I can do is ignore it but it’s annoying. I just want this toxic girl out of my life. She is almost 30.