"Ghost Champagne" by Charlie Jane Anders
Published in Uncanny, July/August 2015
Description, by Lois Tilton (Locus): "For quite some time, Gloria has been haunted by her own ghost. At first it was mostly just an annoyance, and with help from her shrink, she could cope with the apparition. But lately it’s been seriously interfering—both with her stand-up comedy act and her day job in product development. Eventually, she discovers that she has to dig down to the root of the problem that brought the ghost on."