Finished watching Another Earth. Me and friend are having a bit of an argument about the end though.

My friend simply believes that Rhoda from Earth 2 went through all the events in the movie but instead of giving away her ticket took it for herself.

I believe that Rhoda from Earth 2 did not crash into the car in the beginning and had no reason to give her ticket away, so she went on the trip to Earth 1.

Are we both wrong? It's killling mee