I'm so very sorry.
It is extremely hard when a beloved pet falls ill. I know exactly how you and your family are feeling right now. It has been almost a year now that I had our sweet Shandy pts due to cancer. Her cancer was also fast spreading. She underwent surgery and not long after, tumors returned and they grew fast. The only choice we had was to have her pts to end her suffering. It's never an easy decision to make. You will have to weigh the pros and cons. Will her life be improved if she were to undergo more surgery and chemo? Or will this only prolong her suffering? It's never an easy decision.