What to tell my sister about the visit. Any advice?

I went to see my mother in the NH today. She was not in good shape at all. She didn't want to see me, she didn't recognize me, she wouldn't eat, lots of other things. My question to the forum is this: in order for the POA sister to pay me for the gasoline to go there, I have to spell out exactly what I did there and this is the kicker, she only wants a positive report. She won't stand for a generic report such as she was holding her own, or she was fine, or she was pretty good. She wants me to lie and say she was doing great, she ate a lot of food, she was doing the activities and that everything was great. If I don't lie and say the facts, then POA sends me a vile, snotty email outlining what a bad person I am and how I am not helping her and otherwise just a bad email. POA won't talk to me on the phone and won't send money unless I itemize my activities there. I need the money, I can't go there w/o it. It goes against my ethics to lie, but I don't want her "yell" at me and I need the money. Should I go ahead and lie and just chalk it up to a dysfunctional family and say things are great? Your advice please.