Ok so maybe it is just me but when I was at school I remember the tables moving all the time. I don't think that there would have been a full term where we all sat in the one spot. Is it weird that they are still sitting in the same spots that they had the first day of school?

But if she is uncomfortable then I think that you really have to do something about it - and the girls have given you some fantastic ideas.
When I was in 5th class I had to sit between two boys for the whole year. Everyone else in the class got to move about but the three of us always sat in a line. In hindsight I know that it was so they wouldn't fight but at the time I thought I was being punished. They used to undo their flys and measure their penises with my ruler and it upset me greatly but I never told anyone (Now of course I can look back and laugh that they always came up with the same number - 5cm!) But I really wish that I had been proactive and said that I didn't like sitting there.