You are a disgrace OP. You put money before your cats welfare, you knew she was sick enough for you to query a broken limb. You have shown no regret or remorse for your actions and you have shown not one bit of affection towards your cat on this thread - 'The cat died', is that all you have to say about a pet that was supposed to be part of your family!
We are a pretty skint, below average income single earner, four kids but we have paid out nearly £2k in vets bills this year when 2 of our cats became ill, our youngest one was only 2 years old and we did everything we could for her but in the end she was PTS. Our oldest cat had a urinary blockage last month, £1k in vet bills for 3 days kept in, a catheter, tests and loads of meds, he's had numerous UTI's and kidney infections in the past and I knew instantly that he was very poorly each time and he was treated straight away and recovered quickly. I know from my own cats kidney/bladder problems that you know they are ill almost straight away, you can't mistake it.
Your cat suffered horribly and died because you witheld treatment that she should have had as soon as she started throwing up bile let alone when she was glaze eyed and laying in her bed in agony with spasms and renal failure. You could have called a vet and they would have told you on Friday that she needed seeing. Cats are tough creatures and if they start showing signs of illness, especially not eating you know they need treatment immediately. My boy was still eating when he had his blockage, but I knew he was ill. His symptoms seemed to be constipation but I knew he wasn't right so took him to the vet. A cat has 24 hours after poisoning/blockage before they start to get organ failure. Your cat wasn't ill for weeks, she ate Lily probably on Friday and became ill immediately, lily is extremely toxic to cats and hits them fast. If she'd been put on a drip immediately she probably would have lived, you took that chance away from her.
Don't have pets if you are not willing to treat them like any other member of your family, they have only thier owner to look out for them. I hope that her treatment today and her euthanasia have hit you hard in the bank balance seeing as that was the only thing that concerned you. You wish you'd left her to die peacefully at home! She was in agony you cruel and heartless person, her passing would not have been peaceful at all, cats don't cry out when in pain, they lie down and quietly wait for the end to come no matter how they are suffering. My mum died from organ failure and I can assure you that even despite the morphine pump she had she was in agony until the end and you put your cat through that with no pain relief all weekend.
I feel sick reading this thread and I feel even more sick that you think you can defend your lack of care for your cat. I hope you don't have any more pets and that your vet reports you, I know I certainally would.