Okay - here's what you do:
1. Change your lightbulb to red heat instead of clear as the red helps deter the pecking behavior.
2. Make sure they ALWAYS have food available. I use a cookie sheet or other large flat recepticle so they can actually stand in it and scratch around to peck at the food. Yes, they will poop in it. But this is the way they WANT and NEED to eat. Just let them do it.
3. Buy a product called Blu-Kote at the feed store, or betadine will work too. Use this to paint the area. It will protect from infection, plus it doesn't taste very good to the one doing the pecking!
4. Buy some fabric swatches in corresponding colors. Cut about a 5" square, fold it over and cut a slit on both ends. Slip one leg through one side, bring it over her back and tuck other leg up and into other slit. This will be a "saddle" that will allow the new growth to come in. They will get used to it in no time. Adjust for sizing if necessary - also as they grow.
There - hope this helps. Chickens are canabalistic by nature so you have to make sure they have something to peck at all the time. One good pecking distraction is a square of turf grass. Make sure it is unfertilized though! Just throw it in the pen and stand back! LOL Good Luck!