I would give her as much warning as you can. When I told my parents that I was moving to New Zealand (from Australia) it took a while for it to sink in and they took it very hard. Is it not possible at all that you could speak to her face to face as it would be much better that way rather than reading it in a letter (it seems so impersonal). Also, think very carefully before you move, for me I thought it was going to be easy, but it’s one of the hardest things I’ve ever had to do and if I could turn back the clock I don’t think I would do it.
