You are entitled to feel as you do , totally understandable. But your friend is entitled to post what she likes on social media.
If she's not a showy off goady person normally, then she's probably put it on because she was part of a big group and it's part of sharing the experience with them without giving much thought to the wider audience. ie it's not personal towards you or anyone else who is having a shit time of it. OR she's rubbing it in, in which case unfollow her for a while while she gets over herself.
Concentrate on yourself and making the best of your situation.