Knorrig I think it was meant to show that she was uncomfortable with pressuring her about the rape and implying she was asking for it or it didn't happen. She knew it had happened but her job was to try and trip up the accused.
A young professional woman will be as aware as anyone about the rape culture and how it would have played out in court. And therefore she felt uncomfortable actually being part of the legal system that would have hung Yvonne out to dry.
That's how I interpreted it anyway.
Or she could have just had £2.99 earrings in and they were hurting. 😁