I have been watching Japanese women behavior a lot and all seems the same to me. Many many lies when they do not want you anymore. They make a lot of excuses. Even things that make ni sense to have an excuse. I recommend to do the same in return: don't reply the fucking Line messages, don't even read it, make yourself excuses for not going out with her or make an appointment and cancel it at the last moment by saying that your friend wants to meet you. When she asks you to go somewhere nice for lunch/dinner, say that you are busy until next week, when she is about to come to your room say you have an urgent matter and have to leave, etc.