I mean, the bar is in a pretty bad state and, as the owner, she should be worried for sure and getting even more worried as the situation gets worse. It is not unheard of for people to get to the point of breaking down in a situation like that, the real question is how long it takes each individual, how much worse it has to get before that happens. The bar was already not doing too well from the start of the story from what I could tell, which would give the situation a head start, but Sara broke down pretty quickly in relation to how far her story has progressed. However, as I previously implied, she likely had already gotten pretty close to that point before the story.
As for Molly, that's just Molly for you.