"I can tell she doesn't know you're here because she is not also here currently trying to murder me, you, or Bella," she says. "Are you going to tell her you spoke to me?"
"Uh, how literally worried should I be about murder attempts?"
"If she finds out you and me were talking to her genie together she's definitely going to try to literally murder somebody; the unknowns are how likely she is to find out and who she'll go after first."
"How hard would it be to kill her solely via unexpectedly having magical powers without aiming the wish at her?"
"She's two hundred years old and she's been killing witches that whole time. I don't know how many times she's fought other magical girls but I'm guessing more than none. Maybe you could set up a really good ambush... but I wouldn't count on it."
"I'm not sure how much use I'd be if it came down to fighting her directly. I have too many reasons to be scared of what she'd do if I lost."
"I was thinking more like 'kill her in her sleep'. ...Puella magi do sleep, right?"
"And unfortunately, being scared of getting it wrong makes it harder to get right."
"Try not to give Ghyslaine any especially compelling reasons to kill me."
"It was... yes, something. Damn, I get a wish and I can't cure cancer? What kind of discount wishes are these?"