sorry to hear your bad news, i have a special snake, kenzo she was a rescue snake and i estimate her age to be about the same, i am stealing my self for a similar situation, she is showing all the signs of advanced age ,she doesn't move around as much as she used to, and when you hold her she just doesn't have that lower body strength that snakes have, much of her curiosity has diminished she was always such a nosey parker when i have her out of her tank. she really is a very special radix
i noticed it was steve to the rescue again, he can always be relied on to say just the right thing, i hope she lines long in your memory