I can't say that particular scenario ever occurred to me, but I suppose it might work. Convincing other purebloods, I mean - I'm not sure about being Minister. Someone more likeable should be Minister, and I'll just feed him or her all the best ideas.

Too right she's a gryffindor. She just now rubbished me for being worried about her - as if it's completely ordinary to go sneak around Bellatrix under an invisibility cloak. If she'd been caught, she'd not just have been in trouble for spying, but also for stealing her Master's property. Which meant she would have been sent back to the camps, at best, or just killed right on the spot by Bellatrix.