Alexa was right about the room comment and Sarah agreed, although she was not opposed to someone cleaning up for her..
Then Alexa began to laugh, that puzzled Sarah yet she smiled anyways. Alexa did not seem to internalise a word Sarah was saying, yet Sarah did not mind, what Alexa did was her business and Sarah was her friend not her father or teacher.
Then Alexa had to go. Sarah would have waved after the girl if her trunk was not on her head. Then Sarah moved over to the ticket guy, got her thing stamped and moved on in the train