<human>: Give me a shortened version of the text

I rent a sleepout in the backyard of a middle aged woman's house. I have my own power and water meter and usually my landlady (the owner of the house), will give me a bill for these two utilities whenever I ask. Since I've moved in though, I will ask for the bill and it will take her literally week's to produce it. She always pleads that she is busy and that apparently calculating the charges takes some time.
 
It has been 3 months since I have received a bill and I have sent her 3 reminder emails asking for it and she keeps saying she will do it soon or "it's on my to do list". It's getting really ridiculous as I always end up with these massive bills for power and water as there is so much time between them.
 
How do I respectfully demand that she meets her obligations as a landlady better without putting a sour taste in her mouth toward me?
<bot>: Landlady always takes months to produce a bill for power and water and need advice on how to tell her that it's not good enough.