Help Scrawny Kitty Survive

Scrawny is a kitty who was abandoned by her family in my neighborhood.  She started coming around my house and I have started feeding her.  When she came to my house she was very scrawny (hence the name).  She started eating well and got much healthier.  She was doing well and then I was out of town and when I came home she had lost a lot of the weight she had gained.  Even though she was being fed in my absence she has gotten to the point of emaciated and dehydrated.  I cannot afford a vet bill right now as I myself am having health issues but as most of you know I am a huge cat lover and cannot just let her die without trying to help her.  Off to the vet we went this morning and she can survive with the help she needs.  Currently we have three different meds and special food to feed her to get some weight back on her. She currently only weighs 3.1 pounds.  They tried to draw blood to find out what specifically is wrong with her but could only get three drops of blood from her.  She is going to require more testing and care which I need help in paying for at this time.  Any amount will help toward making her a happy healthy kitty who can have a good life.  I normally would never ask for help but in this case I have no choice as I cannot afford to do this on my own right now.  Thank you all for reading her story and again any help would ne greatly appreciated.