The stuff they fret over!
Get busy doing nice things for others and you won't have time to obsess about your own popularity or lack thereof.
Edited to add the word "nice." Thought I'd better be specific when giving advice to DUmmies!
True, but it also works to actually pick a goal for yourself and work hard toward it, which will take your mind off obsessively worrying about other people's feeeeeeeeeeelings about you.
If Frank's right about this wack-job's back story, she's pretty much on a permanent radar lock with the very people who built the pathological need for approval into her personality, which can't possibly turn out well.