It sounds gross, but if you still have it, tease the red spot a bit.
It looks like it is shed intestinal lining, which is normal. Lining will be stringy or at least clumpy.
Blood is thin and runny and won't have any substance (although sometimes mucous can be included with an inflamed intestine).
If it is blood, then you need to start a course of Corid asap as that is the sign of coccidiosis. You would need to treat the whole flock following the instruction label.
If it is shed lining, it is perfectly normal.
If you can't really decide, it won't hurt to treat.
I'll link some poop photos so you can see the difference between lining and blood.
http://www.the-chicken-chick.com/whats-scoop-on-chicken-poop-digestive/
Hopefully all is well. Keep watch on her until you are certain.
LofMc