[LunaTheHamster1]

Hi, sorry to hear you are going through this. My hamster Star was near/probably 3 when she was at the end, she was too much of a fighter and wouldn't give in, her lungs were filling with fluid and it wouldn't have been nice, It was kinder to take her to the vets and for them to help her on her way. In all honesty I should have done it a few days sooner but I just kept thinking she would go in her sleep.
Now having said that, every hamster is different, but maybe if you are feeling it is cruel you could speak to your vet again and see what they say.
Is she cold/clammy to touch? Have you tied feeding her a pea and a slice of cucumber, or is she past all of that?