Ambition. Hers. We were at equal stages of management in a school. Worked well together had a laugh while being loyal to the school ethos and its Head.
I worked very well with the Head but as was late 50s had not ambition to move beyond the senior leadership role I had. Was looking towards retirement.
She had her eye on a deputy Head position...was 20 years younger than me but a bit insecure. Saw me as her only real rival. Teamed up with another colleague to undermine me and try to show me in a bad light.
Head did ask me at one point what was going on but I didn't like the role of tale bearer so brushed it off. I was quite strong, felt I was coping and was due to retire in a few years so why make waves I thought.
However I should have spoken up as she and her side kick managed to spoil the last 2 years in a school where I had been happy, managed excellent grades for students in my subject and was well thought of by colleagues I managed.
Basically she was jealous because her own grades were poor and she had poor people management skills. Ironically we complimented each other...her strengths were in organisation and admin. We worked well together for ten years until she started seeing me as a serious rival. More irony ...I was never a rival at my age and would have been her greatest advocate and support for any promotion she could get.
Still in touch with people in the school. She did get the promotion but has put people's backs up in every area she works in so people skills haven't improved. Even more ironically she's lost many good friends along the way but I don't think she's happy.