Save Lexi

My little girl is in desperate need of surgery. I adopted Lexi a few years ago and soon discovered that she was blind in one eye. Over the last year her blind eye has been getting a bit cloudy and I took her to a specialist to find out what was wrong. The specialist thinks there is a tumor behind the blind eye and that the eye should be removed and sent for tests. Lexi is only 6 years old and could live another decade if this surgery is successful. 
She is the sweetest little miss who greets me at the door every day when I return from work or school with snuggles and head butts. She snuggles and keeps me warm when I sleep and guards the door when I get ready in the morning. 
     I have called numerous vets and have not been able to find one who will allow a payment plan. I have found several charities but they can't give more than $50 or will not pay for emergency surgeries. I can't justify putting her to sleep for this issue when she could fully recover and if I took her to a shelter she'd be put down for sure. I lost my job the day before I took her to the specialist and while, I've finally found a new one, I won't be able to afford this surgery in time. I have been desperately calling new vets and shelters and charities all day to no avail. PLEASE help me save my girl.