I don't think she actually said that was the song she was listening to. The quote went something like "chilling listening to music it's getting hot in here" and then that she was thinking of going for a walk. Question is, was it that song "It's getting hot in here" she was listening to, or was it literally getting hot in the house so she was thinking of going for a walk.....or, I suppose, you could interpret "it's getting hot in here" to mean hot as in uncomfortable or something else. I don't think we know for sure. And she was chatting on fb I thought, not on the phone.
These interpretations are just like a game of "telephone" aren't they....