With young layers especially a range of odd eggs like shell less ones and inconstant laying is pretty common, it is usually just because of their age. They are working on getting their egg laying system into gear. Older birds will also do it occasionally, especially when they are coming back into lay after molting or something. There are a list of other causes, but if she only does it once in awhile it is probably nothing to worry about, just a glitch in the egg laying system where an egg went through too fast. http://www.thepoultrysite.com/publi...ndbook/16/thinshelled-eggs-and-shellless-eggs http://www.avianweb.com/eggproblems.html