You may have already done this but research if DC tentant’s rights reg say anything about this. I have no clue if it does but tentant’s have so many rights in DC I wouldn’t be surprised. Frankly, it’s you right to see your bills so you shouldn’t have to cite any piece of regulation but if it comes down to that at least you’d have the law on your side. I would definitely demand to see them. I know good places to live can be hard to come by but don’t be afraid of irking her… she’d be irking the hell out of me if she didn’t show me something as simple as an electric bill to which I’m paying or contributing, and I’d want a new landlord. Good luck!