I can’t afford amputation but feel guilty about euthanizing, does anyone have advice or a similar experience?

My 10 year old shepherd mix was diagnosed with a mast cell tumor right above her front paw about two weeks ago, in that two weeks, it has already swollen up and burst open into an ulcer. I took her to the vet again yesterday and my only options are amputation of her front leg, or palliative care until it’s time to euthanize. I am devastated, I adopted Sophie when she was just a puppy and while I would love to just do the amputation so she can be happy and comfortable again, it’s just not monetarily feasible for me. Is it wrong to euthanize her because I can’t afford it if she has the possibility of being able to live a normal life again with the amputation? I feel so guilty.