What is Becky Thatcher's reaction to Tom's attentions?

She doesn't reject him. After a period of flirtatious exhibition, Tom writes "I love you" on his slate, which is returned with Becky's pleasure. The two agree to stay at school for dinner so that Tom can teach Becky how to draw. The remaining time spent in class is futile, for Tom has not studied and makes errors in every area of his studies: geography, spelling, and reading.