Read it through once

"She feels it in the air--love, I mean--and she's going very fast. She's got most of the symptoms,--is twittery and cross, doesn't eat, lies awake, and mopes in corners. I caught her singing that song he gave her, and once she said 'John,' as you do, and then turned as red as a poppy. Whatever shall we do?" said Jo, looking ready for any measures, however violent.