If she's just out of school she's still learning... Experience doesn't just appear suddenly. Of course she is going to make mistakes in order to learn. I'm guessing that's why they tell you when you are seeing someone who is fresh out of school and why their fee increases the older and wiser they get. You have been made aware of her inexperience, she's not claiming to be someone she's not. Only so much you can learn from supervision, lectures and from text books. I'd say she's doing her best with the knowledge she has - everyone needs to start somewhere. Telling her what you think she needs to hear may make her feel good, but it's not going to learn or help her to help others.