Blood in the stool is typically one of two things a parasite infection or a blockage of some type it is often referred to as Colitis. Though there are other causes such as IBS (Irritable bowel syndrome) and other more serious problems such as Cancer.
It is always advisable when you notice blood in your dogs stool to seek veterinary treatment. Without treatment she could die depending on what this is. I understand costs are high, but try calling around for a payment plan. I wll also include a list one of our experts put together for assistance with vet bills.
I would recommend starting her on a bland diet of boiled chicken and rice to help settle her stomach down.(1 part skinless chicken Breast to 3 parts white rice). If she refuses to eat you will want to mash it up and apply small amounts along the jaw line to force feed her.
You can give her unflavored pedilayte to replace the electrolytes she is losing so she does not become dehydrated.
You may have to copy and paste the address:
American Animal Hospital Association http://www.aahahelpingpets.org/ Angels 4 Animals www.Angels4Animals.org Care Credit www.carecredit.com God's Creatures Ministry http://www.all-creatures.org/gcm/help-cf.html Help-A-Pet http://www.help-a-pet.org/home.html IMOM http://www.imom.org The Pet Fund http://thepetfund.com/ United Animal Nations http://www.uan.org/lifeline/index.html This list is for local and national help resources: http://www.uan.org/index.cfm?navid=163