The perfect excuse

I've noticed for a while that Melissa will suddenly develop extreme bladder pressure when she's reminded to unload the dishwasher or do her homework. Yesterday we found out she's doing this at school too. Here's what her teacher wrote:

[Melissa] tends to fall behind during language arts because she avoids writing at all costs. She has recently begun spending time in the bathroom to avoid writing or completing other language arts activities and it is beginning to cost her. She will stay in the bathroom for 20 minutes up to 40 minutes or more, (resulting in at least an hour over the course of the day) with the excuse that her nose is runny -- Now, I know she has allergies, and I want her to feel comfortable going to the restroom to blow her nose, but I have discussed with her on multiple occasions that she doesn't need to spend that amount of time in the restroom to blow her nose. She is beginning to lose learning time.

 Kids are challenging.