People tends to change at some points in their lives due to different reasons. But in all, experience will always teach us the hard lessons. In the past , your own similar experience to this person you mentioned here taught you humility and now you see things differently and for good. I really hope this same person rethinks and embraces humility otherwise pride and looking down on people is a step to downfall
I'm going to leave the job soon enough, and perhaps she will have to cope with dealing with people who aren't trustworthy. I hope she learns soon enough