Concubine’s Invitation - Chapter 53

What is don’t understand is that FL went to the palace to change things but she keeps thinking about how she saw this and how she thinks the ML would betray her and what not..I don’t get why FL for this kind of manhwa always state the same thing when the whole purpose of them knowing the future is to change it..they might as well just let everything fall to place if they are going to continue to say ML is going to fall for the original person as there vision