Molly needs a blood transfusion

Hello everyone. Molly is my 12 year old terrier mix. Saturday afternoon, her life took a turn for the worse. We just got her to the vet and they informed us that she has ingested a large amount of rat poisoning. We have lived in the country for almost 15 years and all of our dogs know very well to stay away from poison, mice, rats, and rodents in general. She would never have eaten rat poisoning. Almost everyone (including some vets) believe that someone has done this to my baby. Regardless if someone did it or not, we need your help. Our dogs are more than family, and she has been a part of us for almost 13 years. We got what we could afford done at the vet today; pain medicine sedation, and a bunch of prednisone. This gives her a %50 chance of survival. If she receives a blood transfusion, her odds will go to 90% chance of survival. I know she's old and I know you guys don't know her, but she is my best friend. She was given to me from my mother when I was in 4th grade. She is still so very energetic (except now), and she has so much more life to live. We want our baby to live. Please help us in any way you can. I will be forever in your debt, and so will Molly.