Re: She did it to herself
I'd say that there are a lot of variables here but salary compression can also be a factor. If she joined at a low salary then she would see only small annual increases. Hiring managers have to pay above the regular salary to get new talent in. And then they go through an adjustment phase.
It is the manager's job to level the salary. I think they just took her for a ride. Happens to most minorities. The worst are stock options. I remember in a group I worked in, only white guys got stock options. Not even white women. The director was a good old boy from Georgia.