I have given her multiple times of $250 for buying books, but she kept repeating the the lines of the biology book. How to solve it?
you have to make the key by progressing the nun story. When the chapel appears, click the icon. Go to it in the day time, there is a blacksmith that makes keys for the bathroom and her room. You go to her room, youll find out that she was milking you like a simp for cash. There on out you can advance her story a bit more.