Her breath smelled like garlic.
When she was asked why, her response was always a smile and then a shrug. Rumors spread around the halls claiming that she had a sickness of some kind that just wouldn't let her brush the garlic out of her mouth. Others said that she only ever ate garlic seasoned food. People even wondered if she might have a thing against vampires.
Whatever it was, her breath smelled like garlic and that was just how it was.
Fresh powdered garlic.