They stole priceless diamonds and rubies worth an estimated hundreds of millions of euros.
The stencil was jacked from the music venue where 90 people lost their lives in a 2015 attack.
The country wants the US to "severely punish" the perpetrator. A thumb for a thumb, perhaps?
The cops are hoping to get in touch with her to find out how the work was jacked in the first place.
Also in the news last week: a Boston art heist and an Anish Kapoor is set to come to Brooklyn.