I'm not saying the cloaca will bleed, I'm saying blood will come from the vagina. When the egg breaks, it flattens and the sharp edges of the shell act like razor blades on the muscular vagina. Being muscular and vascular, the hen eventually bleeds out, which may be happening but this hen just does not have the look of a hen that is bleeding out "dazed" look. In the photo, she seems perfectly alert.
mangus, is there any way to get a view of the cloaca (vent)? If it's still yellow, shrunken and not producing discharge, then it is extremely doubtful that she is laying.
I think it's just that she got stuck in a corner somewhere, someone decided it'd be fun to peck on her and the others just decided to join in.