I have some blind cats and it always makes me cringe when I see them trying to jump like Luna is doing. I found that if I put something (like a cat tree) in between two areas, they will actually use that to feel their way over to the new area. Can you do something like that between the end of your desk and the window area? That would allow her to go over there but she would basically be "walking" over. Maybe try putting a board between the two areas first to see if she will use it.