Life saving surgery for my 7 year old best friend. dutch shepherd Zena

Before I rescued Zena I was suffering with heavy depression and multiple mental illness disorders along with me having autism. When Zena came into my life, she became my best friend. She helped me when I was stimming, my anxiety/panic attacks and fainting spells. She does a lot more for me. She has also improved my life and enriched it, I'm able to get out of the house now when she's by my side. During our last vet checkup, I was told that she has a few tumours that need to be removed and she also has an infection that is spreading and they hope that it doesn't get into the bloodstream which could potentially kill her so they need to operate ASAP . Unfortunately, I cannot afford the surgery so I asked for help. I am not ready to lose my best and only friend.