Allison was a student visiting the Royal Mint of Spain with her classmates when the heist took place. Unbeknownst to her, she was instrumental to the timing of the heist, as The Professor knew she would be an important hostage.
Because she was so important, Arturo told her to hide while Inspector Raquel was in the Royal Mint of Spain to check if everybody is alive. If she wouldn't be found, police would enter the Mint. She was found by Nairobi