Mast cell tumor removal

Hi, I’m Ruby. I’m a little 11 year old bull terrier and I am my mommy’s world. In October I was diagnosed with both moderate to severe heart disease and a mast cell tumor. My mommy has done a lot to make sure she has taken care of my heart. I am on medication and doing well. Due to my heart disease, the oncologist think surgery is best to remove the mast cell tumor, the other options involve steroids. Unfortunately this is a costly surgery and my mommy is still working to pay off the bills from vet for my heart. I appreciate any help you can give.