yearly rock was basically rock'n'roll more than anything else, it gotten heavier probably in what? 70s lale 60s?
to me rock ballads are darker than anything and what kind of rock music it is if it does't have any kind of guitars in there?
i only take these as sort of a real deal from her:
Marionette
Memorial address
Moon
Sorrows
Last Minute
Criminal
Still alone
Guilty
Countdown
Return Road
fated
A lot of her stuff is just influenced by the genre, there aren't many that i actually would call rock ballads. And half of the ones that i mentioned above are more mid tempo really. She has a lot of pop rock in her discography for sure. But if you search enough you can find even symphonic rock in there.
this would be a typical rock ballad.