She is even mentioned in Buffy. In School Hard, when Angel meets Spike, we get this exchange:
Spike: Yeah. Come up against this Slayer yet?
Angel: She's cute. Not too bright, though. Gave the puppy dog 'I'm all tortured' act. Keeps her off my back when I feed! (laughs)
Spike: (laughing) People still fall for that Anne Rice routine. What a world!
A lot of the vampire mythos would have disappeared without her.