think of it this way, I assume you are paying something for sessions - she is working for you. Why keep wasting money on you feel is not helping?

You said you've been seeing her for 6 months, why not ask how long she thinks it should take to see any improvement? and when should you try something/someone else? It is your life and your health - be concerned about yourself, psychologists have seen and heard lots of things, and she won't be offended.