Correct the errors in the following sentence.While sitting in cl

Correct the errors in the following sentence.
While sitting in class, she realized she had lost a ring. But happily found it in the women's room after class. The ring wasn't worth much money but had an enormous personal value to her.
【正确答案】：While sitting in class, she realized she had lost a ring. But she happily found it in the women's room after class. The ring wasn't worth much money but had an enormous personal value to her.
【题目解析】：p50