This is an issue which may be based on her misunderstanding of something she's read or been told.
First, find out where she got this idea. Next, give her a resource (other than yourself) that explains simply and briefly what you are suggesting. Let her take it home and read it. Third, at the next lesson, explain how this applies to her, why she needs it, and the general idea of what you want her to accomplish in this area. If there is the necessary amount of trust, she will go with it. If she does not, maybe another teacher would be better for her - and another student would be better for you! Good luck!
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