Just a thought - what are the chances she might be coming down with coccidiosis? The reason I mention this is because this week one of my hens started acting sick, and when I picked her up, she regurgitated some of the liquid in her crop. She hadn't been eating, just drinking.
At first, I treated her for egg binding. Gave a calcium tablet. Next day, she was the same, so I gave her an amoxicillin dose. This usually causes improvement pretty quickly if there's an infection, but by next day, she was the same. That's when it dawned on me that the new sand I had brought home for the run was probably a source for a new strain of coccidia, and I immediately treated her with a drench dose of Corid. In two hours she was vastly improved.
Coccidiosis could have cause the blood you saw yesterday, and it can also cause a slow crop with regurgitation.