Ask an MBA Admissions Consultant

Hello.

I would like to ask an admissions consultant how admissions would think about the following situation.

I have talked with my direct supervisor about me pursuing an MBA. She agreed totally, and she would write a recommendation letter. The letter would say something about me and the firm in the future, such as "The MBA will be very positive for XXXXX to become a manager at the company etc etc". She would probably analyze the impact of my MBA in the company, and would really put focus on that.

However, i think I want to change my career. I am not sure yet. But what if my recommendation letter says that I have a really good future at my actual company, but in my short term objetives, i say i want a career and industry change? What would admissions committees would think? If the see that divergence, will they think i am not being sincere enough?
Should I tell my supervisor I want a career change so that she puts that in the letter despite the fact that it could be detrimental for the letter?

Thanks in advance.