paid off是付清；见成效的意思
所以应该是：B got a good result.整句话是she began to see show her own hard work in learning to read paid off.got a good result 是得到一个好结果啊。。好想你打错了，应该是：she began to see how her own hard work in learning to read paid off. 她开始看到了她自身努力学习阅读见到的成效。也就是获得的好的结果。 供参考