Hmm... It's possible that the blood is from a physical injury to the cloacal area or burst vessels from either hardened fecal matter or straining too hard. The other possibility for blood in the stool is that there's an infection. The white goo and smell you described (was it different from 'poo' smell?) makes me think there may be some sort of infection, especially since this started following the stillbirths.
Boosting temps can help snakes' immune systems, so that would probably be a good idea. Also, keep soaking her in warm water fairly often... You could try a honey soak as well. Basically, dissolve honey in the water the snake will be soaking in. I don't know how well this will work for a snake, but it does wonders treating impaction in my frog.

I wouldn't recommend manually messing with that mass again. If you can get her to a herp vet, that'd be best. But since you said she started bleeding after you messed with it, then I think you either run the risk of doing mechanical damage or spreading around infection by massaging it. I wouldn't risk trying that again until you see if the vet can offer you a safer alternative.
Sorry I can't give you any more advice than this. Keep us updated and let us know if her behavior changes at all!