Hell Inspection

An angel (preferably a little girl, but as always whatever suits your taste) descends to hell for an inspection to see if sinners are properly tortured. Basically, she goes around trying all kinds of torture on herself to see if they really bring as much suffering as sinners deserve. Her attitude I imagine is that she suffers in earnest physically but it doesn't even slightly bother her mentally. Somewhat like in my "Warehouse" story, only instead of considering it beautiful her reason to mentally enjoy the pain is because it's means the demon torturers, whom she is inspecing, are doing their job properly. So when they give her so much pain her body breaks, she's happy and praises them for good work, and when she considers the pain to be not enough she'll be disappointed and can say something along the lines "c'mon, you call this torture, you must try harder if you want it to make sinners suffer" and encourage them to hurt her much more. Makes sense?
And of course she can regenerate between tortures, or maybe even during them, actually I guess even sinners have to regenerate during tortures so that they can keep experiencing it, right? I wanted to say she regenerates because of angelic powers, but now it seems she doesn't even need that as regeneration is just a part of the tortures.