She is beautiful. Talk with your vet and oncologist and see what options are available. It is very hard to watch your fur baby suffer especially when she has been with you for such a long time. I know this all to well since I lost my Panther. Weigh all of your options...quality of life, recovery times and success rates, financial matters, emotional well being and so on and see what can you do. I wish you and your fur baby the best.