I have a 3 year old red comet hen. She has a good appetite and is drinking and walking around but... her comb is pale and she has very little energy. She lays down a lot. This just started and I'm worried. Two months ago her sister became ill and after two weeks of medicine and special diet she died. I don't know what was wrong with her but she had a greenish watery substance pour out when she passed. I don't know what it was or what this is that is starting but I don't want a repeat. Any suggestions what I can do to help her?