The Higher You Climb, the Farther You Fall
Have you seen the movie Up starring George Clooney? If you haven’t, he was a professional firer. His job was to travel from company to company and fire people that the companies’ bosses were too chicken to fire themselves. That’s what the OP’s mother had to do for a living, and it ripped her soul apart.
In the end, the mom was fired by her boss for reasons that the OP didn’t mention. The good news is that the weight of the world was immediately lifted from the mom’s shoulders. No longer was she paid to see people cry their eyes out while packing their office things.