Malignent Infection of a 13 year old female cat

My pet cat had piometra in 2005 and her uterus had to be removed. However the surgeon did not remove her ovary. Thereafter she was in heat very frequently. The frequency kept increasing. We consulted different doctors but no one could help her much. She became more and more restless and for days on end she kept crying which we thought was mating call. Then one day we noticed that she was licking the last nipple -on her right. The nipple, we thought, was bloating up and becoming red. Finally a vet told
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us that it was a malignent tumour and should be removed. She is 13 years old and we were apprehensive about a surgery at that advanced age. Finally itbecame so big almost 2 inches in diameter that we had no choice but to remove it. The operation performed on 23rd May 2013, seemed successful and the surgeon assured us that there will be no immediate recurrence. However within three weeks, three or four similar but smaller tumors have grown around her incision. She has started licking them again and has also started her mating calls. Her appetite and movement are normal and she is alert. The vet has advised against an immediate operation.So we want to go for homeopathic treatment for her as there is no other alternative. Please help.