hi reddit, this is a bit of a rushed post. my best friend struggles with a lot of mental health issues, but i haven’t known her long, so i don’t have all of the details. long story short, she had a traumatic childhood, and now has some PTSD associated with anything before 2015. so when i sent her a screenshot of something funny she’d posted on her old facebook in 2013, it didn’t go over well. she’s now avoiding me, which i can understand, but i still would really like to help. it’s clear my apology wasn’t enough, and i don’t know how to be a good friend. 
advice?