In her case, why not just make a case for the computer that resists magnetization, so that the stuff inside doesn't get fried? Most metals demagnetize with a strong impact, so you could make something like a small hammer that strikes the case at steady intervals. Keep it in a vacuum so the noise isn't an issue. I don't know how strong her powers are, but it should resist low-level magnetic issues.
For you... have you considered just walking around your computer?