17 year old cat dying naturally

Hi

I am a new member trying to find the best way to help my 17 year old cat die naturally,

She is an indoor/outdoor cat.
Over the past couple months, she has lost a lot of weight, I can feel all her bones.
I switched her to wet food which she gobbled up and started to gain a little but a couple days ago she stopped eating, or if she ate even the smallest amount, would throw up sooner or later.
She is barely drinking water as well. She is having trouble getting around
at times and sometimes just stares off at the wall.
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She HATES the vet and doesn't seem to be in any pain so I don't want her last moments to be trauma by having her euthanized.
She wants to be outside most of the time and hides which I know is normal.
I tried to keep her in but is made her distraught.

When she does come in, she lays on my lap purring for an hour or so and then wants back out.

Is there anything I can do to help her in her last days?
Seems like getting her to eat only ends up in discomfort.
But i wish she would drink a little.