Ah, thanks! I was wondering if it was something so subtle that most people missed it... and sure enough, that's it. So I can go ahead and ignore it because WHY WOULD SHE DO THAT?!

(Musical cues do matter, but I don't think it's enough to say definitively that she's going to stay there. Especially given that there were multiple endings filmed, apparently including one with Finn on Tatooine with Rey. So the song title may not even be relevant to what Williams was able to watch while he was composing.)