I used to have the Harry Potter theme as a ring tone that i used as my alarm clock sound.
It drove my boyfriend insane. He hated with a passion that song. For whatever reason he found it very jarring and uncomfortable to wake up to. I switched to the Star Trek theme and he does not have any issue with that over any other ring town.
Maybe it is just a coincidence, maybe something about that song is uncomfortable to people, but it really could be more a random quirk than rude. Im sure we can all think of bad sounds/noises to wake up to.
It sounds like more of a half asleep "what is that horrible (yes she can feel it is horrible) noise?" than a realization and a "great now i am awake"
I suspect it was a half asleep attempt at humor or something she was not crazy about. And after all it did wake her up, so it can be the most beautiful music in the world and still be annoying for her.