I think you might want to examine why you are making those assumptions about why she changed her photo. "In order to get compliments" is not an explanation I would have come up with, ever - to me that sounds exceedingly unlikely. And you don't know how many friends she has on Facebook or how active she is; if you seldom post to FB, very few people are going to see your posts when you do post, because of the way Facebook works. Your photo won't appear in your friends' newsfeeds if they have many friends and you are not very active. Facebook only shows some posts to other people. But if your T posts often and has many friends she interacts with, 50 comments is not that many.