Question

how does the hen lays eggs

Answer 1

Hen's will lay egg regardless of whether or not they are being kept in the company of a rooster. Your laying hen's body is naturally intended to produce an egg  once every 24 to 27 hours and it will form the egg regardless of whether the egg is actively fertilized during its formation.

Hope it will help you.

Answer 2

Hens will lay eggs regardless of whether or not they are being kept in the company of rooster.