She doesn't get on the bus.
It was the last bus for the night too. She could walk her way back to the Byrnes... but she's not going to. Can't make herself go back to that house and pretend to be normal. Can't force herself apologise to Brian again... or Bentley. She doesn't even want to look at them -- at him.
She's a terrible person. The Earth has been invaded by evil aliens and her maybe-not-boyfriend could be possessed by one. The thought terrifies her. The idea of someone taking her control away...
So she stays at the bus stop and goes nowhere at all.