Why? At best it might make her the equivalent of Geordi LaForge, an expert on the technology side of things, but not necessarily groomed for command and diplomacy.
That's not what I meant. My point is that as she'd clearly achieved a rank of some significance, she likely attended the Romulan Imperial War College and would have more than just a technician's background. Otherwise, she'd never have earned an officer's commission. She wouldn't have to be an expert in diplomacy or command to understand the cloak, but she would need to know enough about the cloak and how it interfaced with Federation technology to use it properly. I wouldn't expect a mere technician to know that much.
In any case, I don't think a species as paranoid as the Romulans would trust such an important piece of technology to someone who boasted only a small amount of authority.