Sure, but you can look at this in one of two ways. One is the way you seem to be angling for, where we have an employee who is so disturbingly eager to please that she continues to do work at absurd times when no one should ever expect to be working. The other way is of an employee who has seen how her boss treats employees, and believes that her position, career, and livelihood would be in jeopardy if she wasn't working even in situations where no one should be expected to be working.
I think the second take is more likely. And even if we think it's bizarre that someone could get to the point where they believe that kind of devotion to their job is necessary, it's still alarming and raises red flags that a company culture could cause someone to get to the point that they'd feel that way.