Often when a bird dies of anything, you will find them with fluid coming out of their beaks before and after death. The intestinal system shuts down and this is what happens. I have seen it in nearly every bird that has passed here. So I wouldn't be too concerned with this and this event at...
I am so sorry about your bird.
It is hard to say why she died, however judging from how rough she looks, the may have been simply over mated to death. This does happen. The constant mating wears them down and they die.
So for the rest of your birds, make sure your ratio is correct, 1 roo...
I wouldn't eat birds that are really sick. Most diseases are species specific, which means bacteria's that they carry can not be transferred to other species. Mycoplasma's are tricky little bacterias however and I personally don't want to mess with those things. Once a human gets a Mycoplama...
If one has this bacterial infection, you will need to treat the entire flock. Either of these ailments will leave them carriers for the rest of their days. When they become weak any time in the future, they can have relapses, but generally you can get them healed up enough you may never see this...
Coryza has a distinct smell at the face. Give the face a good smell and if it really stinks, then it is Coryza. If there is no smell, it may be MG instead. Coryza is usually a lot more gummy than MG. MG tends to have more liquid excretions.
Sulphadimethoxine works well on Coryza. Duramycin...
I am sorry about your bird. Over mating can kill a hen and it sounds like this one may be being over mated and may die. The proper ratio of roo to hen is 1 to 5 to 7. So you might add more hens in the future. Remove this male. Over mated hens do not eat, drink or do much of anything. They become...