You're feeding them canned corn??
No wonder she's hungry!!
Get a nutritionally balanced chicken feed and have it available 24/7.
I like to feed a 'flock raiser' 20% protein crumble to all ages and genders, as non-layers(chicks, males and all molting birds) do not need the extra calcium that is in layer feed and chicks and molters can use the extra protein. Makes life much simpler to store and distribute one type of chow that everyone can eat.
Calcium should be available at all times for the layers, oyster shell mixed with rinsed, dried, crushed chicken egg shells in a separate container.
The higher protein crumble offsets the 8% protein scratch grains and other kitchen/garden scraps I like to offer.
X 2 - also, even for birds on a good diet would seem to be starving whenever presented with a treat such as canned corn.