Michelle a monster?
We get to see the movie through Michelle's eyes and therefore automatically assume she's the hero...but some her manipulations seem to suggest borderline personality disorders.
Howard brings her food which she spurns, tells her he saved her life--which she disbelieves--and then immediately endangers herself and Howard's lives by starting a fire in an underground bunker.
She then sharpens a stake intending to spear Howard ala Vampire Diaries as he attempts to investigate (and to presumably save Michelle, again).
She sociopathically drives Howard to anger by deliberately pushing buttons at the dinner table, toys with Emmett's emotions by falsely coming on to him, and then conspiratorially gets Emmett to perform most of the dangerous work for their escape plan (stealing kitchen implements under Howard's wrathful eye, getting Howard to dispose of the shower curtain, distracting Howard while she made the Hazmat suit, and volunteering to singlehandedly subdue Howard and relieve him of his gun).
Even when the suit was done they knew only one was getting out. So of course, old Emmett volunteers to stay behind...with what would be a supremely pissed-off Howard.
(Makes one wonder if she subconsciously set-up Emmett up to be that "hero" with her carefully emoted story about "freezing under pressure," which precipitates Emmett's rushed confession to Howard and gets him killed? Naughty girl!)
She lies, manipulates, steals, gives Howard a 10-point faceplant in an acid bath, and her only act of kindness is to stitch up Howard's cut--which she in fact, caused.
She then locks Howard in a burning bunker and watches it explode--after killing an organic spaceship with some strategically lobbed firewater to its kisser.
Who knows what havoc she will wreak when she reaches Houston?