If you click on the past topics posted by 七頭皮
you will notice that she will only post the first post, and never respond to what others said in reply to her. And the questions are so "shallow", petty-minded and superficial that they are almost jokes (not knowing how much gift coupon to buy if the newly weds did not have a banquet, clashing clothes with her mother in law, etc).
I think that the questions she posted are not "real" questions in the sense that she wanted to know the answers. She just wanted to be deliberately provocative.
Otherwise, it is quite scary that someone can be as shallow as her (and can actually have her own children!).
I don't think it is 自卑心. I think it is pettiness and being superficial, e.g. thinking that you must wear expensive clothes before you can use LV; paying attention to how salesgirls treat you, worrying about wearing the same clothes as her mother in law, etc.