Can sense death: Sure! She'll probably just say straight out anyway
Visible cause of death: Hayley is a Vampire/Werewolf Hybrid (usually just called hybrid). So in order for that to happen she was born a werewolf, then died with vampire blood in her system, then drank some blood to solidify her transition. This would show up as a cut across her throat, as her throat was slit to kill her. There's no physical scar, so just blots to show it.
Command level: Prefer a no on this, but if you ever have plotting thoughts/ideas I'm always game to listen!