do you have other chickens?
if so..how many?
is this hen the only one you have?
please describe her droppings..color and consistency.
what sort of housing or pen do you have for her?
please describe this in detail.
you will need to go to your local feed/farm/livestock supply store and ask for grower feed, or layer feed if she is very close to laying eggs
grower feed has more protein and nutrients for growing chickens.
.if this is your only hen..ask if they will sell you about 10 pounds...otherwise, get the smallest amount you can.
also, try to get some poultry vitamins
and some Wazine 17 worming medicine.
and you might also need some Sevin dust for mites, or poultry dust with permathrin.
as above poster suggested...
for now..you can make her up some oatmeal with water, but not soupy..you can add some cooked egg.
if you have any dry cat or kitten food, you can soak a small amount in water to puff it up, and give her some of that..
or..some canned cat food if you have it..very small amount.
when you can get to a grocery store, get her some plain yogurt..look at the label for "active culture".
and offer her a small amount of that.
and always have fresh water available.
if you have any more questions, just ask..
but it's important you answer the questions.