Since these are wood rats and not Norway rats, you can build a broody cage to shut your hen and chicks into at night out of similar gauge wire to your rat trap.
Make a 2'x2'x'2 wooden frame and staple 1/4" hardware cloth on all sides making a tight fitting door frame for the front. When you go to lock up at night, shut mama and chicks in the box.
Make a 2'x2'x'2 wooden frame and staple 1/4" hardware cloth on all sides making a tight fitting door frame for the front. When you go to lock up at night, shut mama and chicks in the box.