The clone would not speak. Examinations conducted by droids indicated the girl was fine medically. It's not that she couldn't vocalize words-she just chose not to.
Vader didn't seem to mind; he communicated with the clone of Palpatine's granddaughter via the Force. But for anyone who wasn't Force-sensitive (which is to say everyone else in the First Order), the situation could be not only confusing, but unnerving.
"Just complete the job successfully on the first try," Jaica told the officers, "And you need not fear any repercussions,"
While this was easier said than done, Jaica felt the impact of her own words when Bren delivered her some positive news.
"We just received a transmission from Aquilaris," he said, a smile spreading across his face. "We found what Vader has been searching for,"