Your hen is too young to molt... The molt cycle is based on their egg laying cycle, typically first molt will be approximately 11 months after they start laying-> so first molt actually happens when hen is about 1 1/2 years old.
I see your in Texas.. How's your weather been??? Heat is a big stressor for chickens, particular for buff orpingtons, which is what you have, right??? BO's are better acclimated to colder weather like in the north east (I'm in northern NJ and have 3 BOs & a speckled sussex).
What are you feeding her??? She should be getting a layer feed, has the calcium required for laying hens. Do you give her oyster shell ??(calcium supplement), if not you should...
Also, check her for lice or mites. I she has some kind of bug infestation, that could stress her system and she would not lay.
Also II, could she be going broody?? Although I think she's a little to young, if she is laying, then she could be starting to be broody, which too will stop the egg laying..
You can search all these things on this site and get bunches of info... Also, check youtube.com for videos on the lice or mites, you will find excellent videos to show you exactly what to look for and how to fix..
Best of luck, Helen