I don't think it's that complex. Take an insecure person who feels small, boring, neglected, overlooked. That person may inclined to create or latch onto things and try to install themselves as prominent members, because the visibility and power it gives them a huge sense of worth. However, they are also likely to be extremely jealous of their position, which could lead to all manner of unpleasantness such as bullying, because they will have an inflated sense of their importance and be fearful of being overshadowed. Actually, we could as easily be describing Donald Trump here, except he had the money and means to take a great deal of power.
Similarly, such a mindset may also inspire creating fake personas, because fake personas of seemingly very interesting people draws a huge amount of attention, which they can both enjoy vicariously: of course, in this case, by making herself a friend of the fake persona, she can leech some of the interest off for herself, too.