First, welcome to BYC. Secondly, there is little you can do. There are some things you can "try". They are all experimental and perhaps it works and perhaps it doesn't, but you've nothing to lose.
First, ask yourself where she is in the pecking order. Is she at the bottom, middle or top. My guess is that she's pretty low. Does her pecking order position force her to wait while others eat first and eat what they wish?
You don't say how many chicks you have, but if she is the lowest of say, 10 hens, if she always gets the nesting box last, if she always gets pushed to eating last, etc, this is a hen that needs her own space for awhile. If it is possible for you to "mix things up" for awhile and check the results, you'd feel like better about seeing if you can improve things for her.
If you know the pecking order reasonably well, put her with other lower ranking hens in their own pen for a week. Provide them with their own nesting box, etc. Many times, I've seen a non layer begin to lay when she is socially more comfortable. This experiment may or may not be possible for you.
Of course, she may have reproductive, physical issues, even sterility, but before you come to that conclusion, it would be great if you could determine whether this is a pecking order, intimation issue.
