My German shephard won't eat anything. We found her at around 1 month old roaming as a little puppy and kept her after searching for its owner. She has never been a big eater at least like I would have thought her to be although she is mixed with something else we are unsure of. She is now around 6 months but over the last 2-3 weeks she has maybe eaten 1-2 cups per week and is reaching a point where her ribs are very visible. We have tryied pedigree puppy food and also kibble's and bits as well as pedigree soft can food such as beef stew, etc. Recently she has refused everything and I don't know what to do! =( Any help would be greatly appreciated I fear for her life being that I am a poor college student I don't not necessarily have the money to take her to a vet unless there is no other option.

There IS no other option. You owe it to your dog to take it to the vet and find out what is wrong, this has gone on too long.

Not eating could indicate too many things, something as minor as a chipped tooth, a splinter in the gums to something more serious, like disaese or infection.
Is she up to date on all shots?
Is she drinking?
There is just too many scenarios...
You should really take her to a vet.