An Alabama woman who says Discovery Inc. copied her idea for a home improvement show had her copyright claims winnowed by a federal judge.

Melanie Tolbert says she shopped her teaser trailer for a mother-daughter show to several television networks. Discovery, which owns the HGTV channel, was not one of those networks.

Yet the 2017 HGTV mother-daughter renovation show Good Bones lifts elements of her teaser trailer and show pitch, she claims. She filed her copyright lawsuit against Discovery and...