What other powers does Sarah possess?

Sarah doesn't inherit much from her human side. She wasn't superhuman, or anything - she was just like you and me. Her biggest skill is being an expert with guns. This was an interest  that  she picked up from her mother, when she was alive.

Her demon inheritance has made her a little stronger. She has the power of deception. Sarah is using this to make herself look normal to people when they get too close. She can't do this for long and relies on dim light too. It isn't very effective otherwise. Probably she's only partly inherited this and real demons are much better at it.

Her hair seems to be wild and move of it's own free will. So far this looks like a bizarre but harmless side effect.

The Eternal Flame was talking to her for a while. That seems to have stopped for now.

Finally somewhere in 'Beginnings' we saw Sarah apparently breathe fire. Will she be able to do that again or was it a one off aftereffect of the ritual? We don't know yet.