She should have spoken to the nurse to find out what happened. If she didn't get good answers, she should report it to someone higher up.
The sad truth is that nurses are human and make mistakes. It is terrible when it happens, but it is reality. Honestly, "Tearing someone a new one" won't do any good - it has to be reported through the appropriate channels, and looked at to make sure processes are in place so that it doesn't happen again. In the hospitals, medication mistakes are made every day. Luckily most don't make it to the patient; however, there are reporting processes so that we can work to ensure that the mistakes can be prevented in the future.
This is true. I've had to do write ups, not because I wanted to "tear someone a new one"(people in medical care are aware of the consequences and throwing a fit doesn't do anything...they already know) but because I wanted to ensure something similar did not happen again. Most mistakes are process problems not person problems.
Perhaps she sounded nonchalant about it because she knew the other kids med was something less dangerous like Claritin or something(still a big deal, don't get me wrong, but as opposed to oral diabetic meds).
If you do go above the nurses head, I would encourage you to not have the intent to get anyone in trouble but to fix a process problem. Perhaps there need to be measures put into place where there are absolutely no interruptions when giving or refilling medications(distractions cause mistakes).