Oh wow, she is looking SO MUCH better! What a beautiful girl. My husband loves muppet dogs.
In regards to finding low cost clinics, just do a google search for low cost spay and neuter clinics in your area, and you should come up with something. If not, a lot of times your local shelter offers low cost vaccinations and such.
Good luck with her! I hope that if an owner doesn't come forward that she finds an awesome home.