You also mentioned this friend is a pathological liar. That likely applies to her FB posts. It may be her defense in response to screwing up royally. And a way of reaffirming to herself and people who dont know the whole story that shes awesome.

As to its not fair. I understand the feeling of doing all things right and seeing someone reap rewards that we feel like dang how is that fair? Im a believer in karma and also that while it seems all the wrong people get things that I feel I "deserves" (money, can easily find another job etc) I know that Im living life with morals and treating people the way they should be treated instead of crapping on them.