A friend (not very close) wants to borrow a book that I have (she's thinking about buying the same book). This book is study guide of sorts, so I've answered questions with my personal feelings and thoughts and the same with the prayers I've written in the book. I'm not comfortable with letting her use the book, as I've written my personal thoughts in there. If I tell her no, she will take it personal, not sure if what to do. Should I just trust her and let use it?