Sick Hen -- please help!

The past few days I noticed one of my hens (a RI red) staying away from the rest of the flock. She would always be the last out of the coop in the morning, and a few of the other hens would peck her and attack her when she would get near them.

I then noticed she had clear, watery poop. Also would have some greenish diarrhea as well.

I brought her inside, gave her clean water with electrolytes. Her crop seems a little full, and I have been massaging it every so often.

However she still is doing small little green poops (where I have read it means she isn't passing food through) and the crop hasn't changed in size.

I read that I should try to empty the crop myself, but I'm not exactly sure how to go about this and I don't want to hurt her. What should I be doing next? I appreciate any help.