In the Heat of the Night (which included Hearbreaker) was 1979. Even discounting that, she's close enough, since that's the only person who could compete with Ann Wilson as a female rock vocalist.
As for Stevie Nicks, I always liked her voice as a singer with other people. She and Lindsay Buckingham both had real rough voices that actually sounded great together. Still, Ann Wilson blows her away (and still sounds great).