Whitney Wallace, 35, found herself apologizing to two grown-up princesses at the Little Princess Pop Up, a 90-minute fairy tale entertainment and dining experience in Rockville Centre.

“We want to [know about things] that haven’t been clarified by the investigator, to be able to understand a little more about why I was left without my princess Jocelyn,” her father tells EL PAÍS.

But once she steps inside the four glass walls, it becomes clear that her nickname “The Warrior Princess” is well earned. The 29-year-old combines pinpoint accuracy with a relentless work rate and ...