MIAMI — A businesswoman from China who was arrested last month at President Trump’s Mar-a-Lago resort in Florida when she showed up with a bag full of questionable electronics gear was indicted on Friday after a federal grand jury found there was sufficient evidence to hold her for trial.

Yujing Zhang, 33, told the authorities she had come to the South Florida resort at the invitation of a Chinese group that was advertising opportunities to attend social events and rub elbows with political celebrities — a business campaign that has raised questions about security at the exclusive private resort where Mr. Trump and his family are often in residence.

The trove of curious electronics Ms. Zhang was caught with — including a thumb drive infected with malware, four cellphones and, back at her hotel, a signal detector used to find hidden secret cameras — prompted suspicions, the authorities said.

The grand jury indictment handed down on Friday did not add any espionage charges, but instead contained one count of lying to a federal agent, which carries a maximum five-year prison sentence, and one of accessing a restricted area, punishable by a year in prison.