Thank you all for your advice.
When I picked Rita up this morning, I asked them to show me the place where she was kept. She was sitting on a plastic board on the concrete floor. The heater was on and room was actually warmer than our house, but it broke my heart to see her sitting with her back pushed against the fence as if eagerly waiting for someone to pick her up. Apparently twice a day walk was not enough for her.
The kennel is really clean and was the best and largest among a dozen of kennels I looked at in the area, but I’d regret like no tomorrow (is this the right expression?) if something happens to her.
Last time when we were gone, our dog-walker left Rita at our house for about seven nights when her husband told her he no longer accepts Rita. At that time, we were already in Japan and didn’t know what happened to her. Later we heard from our neighbor that Rita was crying all nights on the first couple nights then came to know that the dog-walker left her here all night.
I don’t want to leave Rita all by herself for many nights either.
Like Barklessdog wrote, it’s probably the best to hire somebody who can come to our house twice/three times a day. But in that way, she’ll still be all alone at night.
So if we cannot find a house sitter who is willing so stay here over night, I’ll make a circle of friends and relatives who are willing to stay at our house. I’ll create a rotation chart by Excel.
What do you think of that?