Buffy the Vampire Slayer Once Became a Vampire Herself – Sort Of. In Season 1, Episode 10, "Nightmares," Buffy herself became one of the undead.

Does Buffy get turned into a vampire?

Buffy Summers was temporarily transformed into a slaypire when Billy Palmer's astral body caused people's nightmares to manifest throughout Sunnydale.

Why didn't Buffy turned into a vampire?

In Buffy vs Dracula, Dracula tells Buffy that she must be on the cusp of death before drinking from a vampire will change her. Angel also tells the Scoobies in Graduation Day that Buffy didn't drink from him so wouldn't be changed, implying that she was close enough to death that she would have changed.