Fiona is certainly not happy about her waning powers and increasing decrepitude, never mind that her hair is falling out in chemo-induced tufts. She may be supreme of the coven, but she’s not immortal. (What’s Angela Bassett’s secret?)
All said, I do appreciate that she’s out and about, drinking whiskey and martinis, despite always being the oldest woman in the bar. Unfortunately, that’s made her prey for the reanimated ghost of an axe murderer who’s been stalking her since she was a teenage witch. All he had to do was call her “pretty lady.” It’s tough out there.