*spoilers*

I hadn't even thought about that actually. I was confused during the scene because for a second I thought she was speaking with foreign astronauts in near orbit. Then I figured it was a recording that one of the astronauts had made singing to his kid.

Honestly that was one of my favorite scenes of the film. It really hit you how alone and isolated she was hearing a voice in another language as sort of an ironic reprieve before dying.