She is trying to one-up you. See https://dictionary.cambridge.org/us/...english/one-up

If you are not good at lying and fading away gradually is not an option, tell her that you do not see a future for the connection, are glad that you have provided her with the learnings that she hopefully finds useful, wish her success, but won't maintain the connection. And at that point, see how she responds. If she does not respond well, block her on FB.