It's hard having to face up to one of our cats showing her age.
I remember the first cat I remember being part of the family, Lucky, aging in the same way before finally passing.
Does make me wonder if Cissy is missing her sister and that's affecting her.
I'm expecting Cissy to pass in the next few months, and I'm trying to get used to that before it eventually happens, since I'll have to be the 'adult' when it does.