@Мөнхжин0
Electricity can be very expensive in some locations. I can easily understand how a guest can use 20% of what a host is going to get paid each day, just in electricity cost, we in my state of South Australia are in that exact position. I can understand some hosts putting restriction on the amount a of power a guest can use. Some guests are power vandals, they will go out for the afternoon and evening, but not before they wind the air conditioning thermostat to it's maximum so they will have a toasty warm, (or freezing cold in summer) place to come back to.....they just simply waste power.
Having said that, the owner must state one of two options in the listing description.
1/.....Additional electricity will be charged to the guest on a usage basis.
2/....Electricity usage has been allowed for in the nightly listing amount.
The host has a right to expect the guest to be fair but, has no right to spring an undisclosed cost on the guest with no warning!
From what you are describing , the host does sound unreasonable and I would advise that you dispute this charge with the host telling her she is not entitled to make additional charges that she did not previously mention and let her fight for it through the Airbnb resolution centre!
Cheers......Rob