Poppy butt not eating

One of my Queens B”s has a really poppy butt I’ve seen two of her dropping since yesterday and one was water the other a big plop. TMI I know. She has stopped eating even her all time favorite scrambled eggs. She was foraging here and there but most of the time she is standing in one spot closing her eyes on and off. I brought her in but it seemed to stress her more. She seems happier with her two sisters. What can I do to help her? I’m worried they had too much watermelon leading up to this. I was giving them some frozen watermelon for about 4 days straight due to the heat out side. Did I hurt her? What can I do?? Anytime a one of my chickens has done this they have died so freaking out