A little trouble

My daughter is in 3rd grade and has been at the same school since kindergarten. We loved her school because it's small and she has been able to get extra attention when needed. This year however, we have been receiving multiple calls from her principle.

My daughter was caught making a mess with water and soap in the bathroom on Friday morning. She was punished by having to sit in the office until lunch.

I just got a call that she is in I.S.S. for the rest of today and tomorrow because she decided to look over the bathroom stall at another student going to the bathroom.

We don't encourage this behavior at home and can't figure out why she has been so terrible this year with these incidents getting to be quite frequently. Anyone have advice on what to do???