Ruby will meet her in the spa with the earrings and Erin will get a brief demonstration of her consciously dropping her Aura. Focusing on keeping it down will also go a great way to stopping her freaking out about getting stabbed through the earlobe, so, two birds one stone.

Of course technically she shouldn't be going right to proper earrings, but her Aura going back up afterwards should account for that somewhat. And so after that, Ruby will be walking around with Weiss Schnee's latest earrings in.