Dont let her eat anything for a couple of days! The first day, nothing but water with apple cider vinegar in it, a Tablespoon to a gallon. Massage the crop, but not upward. Give her bread soaked in oil or syringe veg oil into her mouth before the massage. Dont let her eat anything but soft stuff like scrambled eggs and active culture yogurt for a couple days after that.
Worming them once a month is WAY too much. You'll never be able to eat their eggs if you use chemical wormers that often. My three year old flock has been chemically wormed twice, period. And only because I saw a worm in poop.
