"It really is." Being stuck in hiding was, in a larger sense, a bit like being trapped. And Ginny suspected Bill was also alluding to his marriage, but being stuck in a mirror - Ginny had long ago given up trying to imagine what it was like for Harry.
"She can't be that upset over something so trivial, can she?" Ginny used her wand to gather up the broken glass, and idly started to piece the shards back together. It didn't look worth saving.