There is a difference between "chastising" and "psychoanalyzing" AND having "boundaries".
If you tell her "I know what you are up to, you are playing games, and I don't like it" ... that is chastising. You don't want to chastise a girl you barely know.
If you tell her "You have a wall around you, you are afraid to let it down, when you come out of your shell, call me" ... that is psychoanalyzing. You don't want to psychoanalyze a girl you barely know.
However, it is OK to have boundaries.
I wouldn't talk about HER, I would instead talk about ME (and, more precisely, my boundaries).
I would say say something along the lines of: "Look, you are a great girl, but I've got a no flake policy, my time is very important, and I'm only interested in people who not only want respect, but give it in return. Look me up sometime if you think you can actually show up.

"