I don't really see her as a healer though I see her more as a toxic fountain. Also speaking of debuffs i have kind of a basic kit.

Passive thing(cause needed)- Semi immune to poisons especially her own.

Toxic breath-You know poison them to death.

Healing mist- A mist that provides cover and recovery for allies within.

Acid spray-Burns slightly, but is more effective at destroying armor, and weapons,(Metal, and plant ones.)