I am trying to put the pieces together Jang. It concerns me that she is not actively standing up and can not fly, though she tries.
I am also thinking she may be eggbound as Mary suggested earlier.The area where a pigeon expells their waste and the egg for females, is the vent area. Look and see if it is gummed up or obstructed in any way.
Do they eat well?
Is the water clean?
Does she have all her feathers...check the throat for canker?
Are you suppling her and the rest of you pigeons with grit? A female that has produced eggs especially needs grit with calcium. It is the grey color.
How old is she?