Sick hen please help

This is my hen Tidbit we’re very connected to her we’ve had her for almost 2 years now and she’s my last hen who was connected to my forever rooster DR. P who sadly disappeared in December. Dr. P was more of a pet to me than anything else and we had a very very very special bond… Tidbit had kind of stepped up and takes care of the flock since he passed… out of nowhere this morning, tidbit seemed extremely off, walking around slowly , but not going very far and moving pretty slow… she also let me handle her very easy. wet stool all over her vent .. one of her eyes is pretty squinty and not much interest in food or water. I have her resting in a milk crate and I’ve been sitting with her for hours. I’ve been using a water dropper to get some fluids in her, but I’m very very concerned because I haven’t seen much improvement over the course of the day. Does anyone have any advice or experience with something like this????