Did you switch the book that she reads while she is in bed called "Time Machine" with the Female masturbation?
If yes, then you need to buy the snooper and spy on her from 20:30 and after. Use the snooper on her closed door. Then next day you will see the message "I know what you did", she will deny it and then you will have option to upgrade snooper so that you can record her. Buy it, upgrade it by dragging upgrade on snooper (while in inventory), then use it on closed door. You may have to click it more than once to use it.
If no, then you need to get the female masturbation book from Vanessa's room, its the right hand side drawer. Then, when you see Lola reading a book lying on the bed, ask her what she reads. She tell's you that is a book called Time Machine.
Then, when Lola is not in room, take that book (when game gives you option to go forward in her room, just hover over her books i think its the one in the right hand side over the drawers) buy glue from shop, get knife from kitchen, use knife on Time Machine book, use glue on Time Machine cover, use glued Time Machine on female masturbation book and when the book is ready leave it where you initially found the Time Machine book in Lola's room. Then buy snooper.
View attachment 532398