@red225, unfortunately it can be even harder.
Ignoring everything else, it becomes a “he said, she said” issue.
Sure, there might be a few other members that might speak up, but he has a higher position, so his words would normally have more weight.
And finally, I’m sure we can both agree, a guy like that, did not get that job “honestly.” And it’s very likely he knows enough people in the right places to shut down any words of dissent, even if all the members working at that branch spoke up.
Can she quit? Possibly, but it’s probably just as easy for him to mess up any job prospects she might have... or possibly, she might not have any better option, even without his interference.