Sorry for your loss.
The blackish color makes me think dead blood- I've seen (and drained) gloppy yellow that was obviously end stage EYP but (so far) not black. Did she have any kind of trauma that might have caused her to bleed internally? That's the first thing I thought of - especially if she was laying normally up to a few days ago.
Also- just as a chicken medical kit suggestion- next time you're at a farm supply store I highly recommend picking up a few 16 gauge needles- 14 gauge if you can find them. Usually they're found in the cattle section. The larger gauge makes for easier draining, especially if you find yourself with a thicker goo that needs to be drained.
The blackish color makes me think dead blood- I've seen (and drained) gloppy yellow that was obviously end stage EYP but (so far) not black. Did she have any kind of trauma that might have caused her to bleed internally? That's the first thing I thought of - especially if she was laying normally up to a few days ago.
Also- just as a chicken medical kit suggestion- next time you're at a farm supply store I highly recommend picking up a few 16 gauge needles- 14 gauge if you can find them. Usually they're found in the cattle section. The larger gauge makes for easier draining, especially if you find yourself with a thicker goo that needs to be drained.