Do you really think that telling her untruths is the way to get her back?
Honest, truthful communication is best in my opinion ~ but that's just my take on it.
Let us assume that this brings her back to you ~ and then she discovers that you lied to her ~ what effect do you think that this would have?
Maybe it will work ~ or maybe she is just relieved that you now agree with her re the break-up.
Good luck