It makes me angry and yes I sort of hope she will get her karma
And yet you say you’d be nice to her if she would speak to her, you clearly stalk her social media as you know so much about her life, you notice when she’s out and you see her and you really want her to talk to you and can’t understand why she doesn’t. Then you assume it’s because she thinks she’s better than you and develop all these worthless feelings.
I mean this kindly but you’re just not in the same social sphere, she’s not your friend now. She won’t give you much notice. Not out of malice or because she thinks she’s better, just you are an old school acquaintance and she’s moved on
It’s clearly been a long time since you were at school. A very long time. Years and years. And you’re still so focused on this woman, her looks, her life, what she has, how you compare, fantasising about what she is thinking about you, wanting to be her friend, feeling worthless again because she doesn’t reciprocate that feeling.
It’s very unhealthy and only hurts you. I honestly think seeking therapy to deal with your feelings, this woman is just a focus, the issue is yout own happiness with your life.
If you were happy and fulfilled you’d not be focusing on her. Try to resolve that, what do you need,,friends, partner, job, what’s not going well or is missing?