She is one of 28 women who were denied asylum and who have filed a federal lawsuit seeking new hearings because, they said, their original “credible fear” hearings were conducted improperly. An appeals court rejected their claim on Monday.

On Wednesday Ms. Alberto and 21 other women who call themselves “Madres Berks,” or “Berks Mothers,” restarted a hunger strike they had conducted for 16 days in August. Their action drew renewed attention to the Obama administration’s policy toward migrants from El Salvador, Guatemala and Honduras who have crossed the United States border in order to flee extreme violence…

“I have been here for 320 days,” Amparo Osorio, 26, who came from Honduras and has a 2-year-old son, said on Tuesday. Like all the women detained at Berks who spoke in telephone interviews conducted in Spanish, she asked not to be identified by her complete name, for fear of retaliation by staff members.

“What we want is for our voices to be heard,” Ms. Osorio said.