I'd be inclined to give her a chance and try the insulin injections - 15 really isn't all that ancient. If she is having an operation to remove the tumour the vet can sort her teeth out at the same time, and I think you will find the insulin will make a massive difference to her really quickly. A friend of mine injects her cat every day and the cat is good as gold, and comes to be done.
Good luck with whatever you and the vet decide is best for her.
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A big boy did it and ran away.
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