I can understand Bugs' frustration with Hannah; however, I believe it mainly stems from Bugs regretting her decision to be 2nd stew. And her constant nitpicking of everything Hannah does bears that out. What I find to be more disturbing is how Bugs plays the "poor me" card while actively working to undermine and bad mouthing Hannah with the other crew members, including the Captain. She is the worse kind of office mate and employee. If you are a manager, Bugs is the kind of employee who will go over your head to your boss to curry favor and protection. If you are a fellow employee, Bugs is the kind of employee who curries favor with the boss while trashing your work. What is sad about this is that she is actually a hard worker.
Bug's trembling voice when speaking to Hannah was due to nervousness because she had to actually do her own dirty work. Bugs was hoping to both malign Hannah to the Captain and have the Captain sanction Hannah. When that did not work, she knew she needed to do it herself and she was not planning on that. But Hannah is a master at mind games. Bugs tipped her hand. Hannah knows her newfound friendship with Adam bothers Bugs. Hannah knows that by staying calm during Bugs' little speech, it would drive Bugs crazy. Because Bugs expected and wanted a confrontation. And Hannah did not give her that.
And Malia. Ugh. Women who pull the "women's rights" card as a way to excuse their sketchy behavior are infuriating. Yes, you can have a relationship with your boss. But expect to deal with the fallout. And yes, people who feel they are equally qualified for your promotion can feel out of sorts based on the criteria of the job, not because you are "a girl and are pretty."