Where are you located? There may be an organization that can help you with vet bills: http://beingstray.com/cats/financial...ance-for-cats/
Also, try calling some vets in your area and explaining the situation. Perhaps somebody would be willing to take a look at her for a reduced or minimal fee.
"To close your eyes will not ease another's pain." ~ Chinese Proverb
“We must not refuse to see with our eyes what they must endure with their bodies.” ~ Gretchen Wyler