Unfortunately, Heather wasn't able to help Sam for multiple reasons. For one, the spider creature wasn't going to stop being a risk until it was dead, and for another, Heather didn't exactly have the necessary weapon to take down a ghost. ... And neither did Sam, once the ghoul took control of the rocksalt shotgun and began using it against him.
Glancing off towards her companion every chance she got, she finally heard a final shriek from the spider that signaled she'd killed it. What did it take twenty, thirty shots? Either way, it didn't matter. It was dead.
Looking back to the corpse of the monster she'd just taken down, Heather paused a moment. Wrapped around it's left wrist, nearly tangled and embedded into it's flesh, was what looked to be some kind of necklace, with an odd-looking pendant hanging off of it. Taking another glance towards the ghost, who was still shooting off shotgun rounds near where Sam was, Heather made a beeline for the spider-thing and immediately began unraveling the object from it's wrist. Blood and bits of flesh stuck to her hands and underneath her fingernails, but Heather was hardly squeamish by this point, and it didn't bother her so much.