hi! so yesterday i was checking on my chickens water to make sure it was not hot, the weather has been really hot. and when i went out there i noticed that my barred rock was acting weird. she is two years old. she was not walking as much and has fast has she always does and she was kinds slanting her butt to the ground? i checked her over and could not find anything wrong so i left her be and just kept an eye on her. well this morning when i went to let them out of the coop she was laying on the floor? i went over to her and know when she trys to wal she limps spreads her wings out and her butt goes to the ground? she would not go out f the coop this morning and she wont even try to walk. i have no idea whats wrong, i tryed filling her belly for an egg but im not sure how, and i did not fill anything. i sat her by the waterer cuz it is going to get hot today but should i keep her away from my other birds? what do i do??? what is wrong with her?? she has always had some trouble laying her eggs, and i have not had the money to buy them crushed oyster shell. could that be it. they eat layer pellets, and i didd just change the brand of feed they eat, could that be it?