It sounds like you're doing almost everything you can imagine and I'll offer that you try adding a small amount of psyllium (Metamucil tm). Immodium AD (loperamide) about .1 to .2 mg per 2 lbs of weight. There are measuring spoons and baby medication dosers that will help measure.
If you don't find this improves things in 24 hours, you need to make the vet appointment. For this to be going on so long isn't right and she might be advancing with a serious condition that would be more successfully treated if caught early.
Places you can begin looking for financial help in the treatment of your pet
http://www.imom.org/
http://www.uan.org/index.cfm?navid=163
http://www.mspca.org/site/pp.asp?c=gtIUK4OSG&b=126801
http://www.animaladvocacy.net/shelters-rescues.html
http://www.lovethatcat.com/spayneuter.html
Don't forget to call your local Humane Society for guidance as well. If you have a Pet Smart in town, they often have the numbers for rescue organizations that may also help, at least with recommendations for where (or who ) to go.
Many have forgotten this truth, but you must not forget it.
You remain responsible, forever, for what you have tamed.