I don't think it's a reference to
I think it's just that Rozemyne is still super weak and picking up a chunk of metal, even silver is too much for her.
Right but the setting of Rozemyne at a desk with noble attendants made me think it's set post-P5V12 while she's working her new job, but her hair is down so she's still clearly underage. We barely get any descriptions of her working in the castle in P4 as well, so I couldn't place it mentally