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I am so thankful for all your thoughts, and I given Krytsle appropriate cuddles from you all. The litter tray may work, but she has not has any more accidents the last 3 days. This morning I was gardening, and although she is totally deaf, she followed me around all the time, demanding attention....which I happily gave her. Her hearing may have gone, but here eyesight is purrfect.
Currently she is sleeping on the sofa, and will receive more cuddles very soon.
Thank you all.