Thank you all!! This is such an encouragement. More than anything else, by writing those posts and reading your answers, I realized how deeply I'm attached to Rita. Thinking about leaving her behind made me depressed to the level of numbness. Now, thinking of the possibility of living with her forever (I mean until her end) changes everything into different color. (When I listen to love songs, I first think of Rita. I’m in love with her that much, which I’m sure you understand. –or not.-)
Also, about the house sitter, a sushi chef couple of the sushi bar where we are a regular customer, may agree to stay at our house while we are gone.
(Last time, a waitress at the restaurant stayed at our house to take care of Rita. To her kindness, Rita responded by chewing up her underwear and bras.)
So we may be able to expect that Rita’s fur is shining and so are our Japanese knives, when we come home.