Like the title suggests

My miss Ollie cat is 15 (16 in oct) She went to the vet 3 weeks ago as she had a lump on her lip and was generally unwell. A shot of cortisone and AB's fixed her up. Friday she went back for a recheck. This time she hid from us which was super weird but apparently normal..

Vet gave her more cortisone. Since then she has gone down hill she isn't eating and not really drinking. It has been very cold these past 2 days. (cold for CQ)

Normally in winter she would have her sister to cuddle up to but Missy passed away in Oct last year. Her breathing is normal and she still purrs but she is stiff and looks miserable

I don't want to take her back to the vets as I think this last trip pushed her over the edge a little. She was not impressed at all with me

So if you had an old cat what did they do in the days or weeks leading up to them passing away?