how old is the hen?
has the hen been wormed?
if so when? and what was used?
when did she last lay an egg?
has she ever laid a soft shelled egg?
is she walking like a penguin?
feel the vent/belly area for heat or swelling..
check vent for drainage or if you can see an egg...
describe the droppings..color and consistency..
you can try sitting her on a warm towel..microwave can warm the towel..not too hot!
put her in a warm, quiet, dim place for an hour or so..so she can relax..
some people set the hen in a warm bath..
tho, if she is eggbound..it's likely after several days, she'd be dead..
tho she could have a soft shelled egg or some other condition going on..