A movie about a medic. Her family killed in US, then she goes to birmania, the war comes and she must escape?

It is about a medic.
Her family is killed and she decides to go to Birmania to take a
break, but then the war comes and she must cross that nation to get to
thailand. She became friend with an old man and they all cross to
Thailand. At the end of the movie she stays in the border helping the
people... What's the name of that movie??