Neighbors complained and police threatened to arrest her, so she and the American Civil Liberties Union of Louisiana sued the city.
A judge ruled in her favor Thursday.
“I imagine it will be back up before too long,” ACLU of Louisiana executive director Marjorie Esman said of the display.
Childs erected the lights on her roof last month. She has removed them twice — once after a police officer told her she could be fined and again after another officer threatened to arrest her, her lawsuit said.
U.S. District Judge James Brady issued an order temporarily barring city officials from interfering with the display. The two-page order said the city’s “continued efforts” to prevent Childs from displaying her holiday lights will violate her rights to free speech and due process. He scheduled a Jan. 7 hearing in Baton Rouge.