I have been in my job over 3 years and feel its time to move on. Tomorrow I am handing in my job application for a job in another department, the company policy is to tell you line manager when applying. I am worried to tell her as she is a possessive person and feels threatened when competent staff leave. People have said to tell her I enjoy my job but thought to apply for this job would be to broaden my experience or is a challenge. What is best to say as I don't want to piss her off.