At the time we agreed to cut her rent it wasn't clear when the furlough payments would be backdated, so it was reasonable to think she really was going to struggle, but she's certainly had it by now, so if she's still claiming she can only stretch to £500 (between her and her also furloughed father) then I'm pretty comfortable asking for more transparency.
I'd imagine we'll end up writing it off. She works in the travel industry so I doubt she's gonna be gainfully employed any time soon.
As for GDPR, we're not asking for proof in the form of bank statements, etc. Just for her to give us her own breakdown, which she's agreed to. Obviously she could tell us anything...