Hey, Pikachu, so when you interact with the door in the future, she should start talking to you. You decide how to respond to her using the number keys on your keyboard, and from her information, you can go back to the past and act on it.
Strangely, I don’t know why she isn’t talking, as I just tested it for myself, and it’s all working.
In a nutshell, you go back in the past to change the future.