Gammall - dead?

once you get back to Audale with the artifacts go to the Bradshaw
Monument to place the Heart.
Try this:
there are 2 sets of steps up to the monument - forward a few then left
to the statue. Sit at the top of the first landing in the shadows so
you still see down towards the trees at the end, on the left is an
archway. Gamall and a stone statue will probably be patrolling.
Wait for her to go up the ramp and throw some oil towards the archway
on the path, maybe two or three. Then fire a noise arrow towards the
trees. Gamall will come running down the ramp and head towards where
the noise arrow went, slipping on the oil. Shoot a fire arrow at the
oil and she disappears while the flames are still there, reappearing
when the flames die. Walk over to her and she's charred and dead.
Go to the graveyard at Fort Ironwood though and she's prowling there
alive and well.