Make sure she is only drinking Corid treated water. Dont give her anything containing thiamine. Blood in feces isnt a good sign. Continue to inspect her feces for blood. If there is blood in her feces tomorrow morning, I recommend purchasing SMZ-TMP to treat her. If she is under 5 pounds in weight, give her 1/4 tablet twice a day for 7 days. Use a pill cutter to quarter the tablet.
Here's where you can buy it:
https://www.valleyvet.com/ct_detail.html?pgguid=91F10ACA-FB33-44F4-9A6C-40FCD628F49B&q=fish smz-tmp
Here's where you can buy it:
https://www.valleyvet.com/ct_detail.html?pgguid=91F10ACA-FB33-44F4-9A6C-40FCD628F49B&q=fish smz-tmp