There is no Z space on this Saturday's EK206 JFK-MXP. And JFK-MXP will need to have been ticketed as a separate leg (if on MMB it shows JFK-DXB, then no way it can be done online).

If she's a Skywards member and has enough miles in her account, and provided there's a vacant seat on departure, she could request it on board - am assuming she's travelling alone. But the flight seems oversold so, if she holds status she might be op-uped.

To clarify, how did you book this ticket?