Geriatric Yellow anaconda

[culturevirus]

Please forgive the question by way of intorduction, I know that online communities don't like drive-by posting. But I am in a semi-desperate situation. I have a yellow anaconda that is approximately 22 years old. I have had her since she was born and have never had any health or feeding problems with her. She has gone off her food for a few months now and does not seem to have any interest in eating regardless of how I "prepare" her food. What little I know of yellow's lifespans I gather that she is getting near the end of her natural lifespan. I'm not sure whether I should take her to a vet or I should accept that this is the end. Any suggestions for husbandry changes that encourage appetite? Any advice at all?