S.R.
Does she know that she cannot go to school until she is able to wipe herself? You might want to try having her older sister help her with this. My daughters are 9 years apart and my youngest one loves her older sister and would do anything she asked her to do. If your oldest does agree to help, I would reward her with something special. If she is afraid of getting her hands dirty, keep a package of baby wipes on the back of the toilet and she can wipe with those. That is what I did with mine. Worked wonders. Good luck.