Did she really change over the years? From a human point of view, you can probably say it's a unhappy face, but for a cat face, I don't know. She lives in a good home, is taken care by a human who understands her needs, she has Lily for company when you are not there, well, she should be happy!
When I compare pics of young Peppito and today's Peppito, I also see differences. Except ageing, I think his expression changes because he has a longer experience of life. He's more quiet, is less scared of his environnment, for instance.
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