I hate that it comes down to my 10 year ODD kid questioning the ability of an adult to her job, but this monitor just doesn't understand the importance of the pen being there.
This doesn't change the situation any, but you could look at it differently.
Maybe this is the first step in Duckie learning to manage her own EpiPen?
My daughter, at 10, would definitely have been up to this, and might have even asked for the right to "check" and "refuse if necessary". DS, on the other hand... possibly still couldn't even if he had to (thank goodness, we don't), and he's in high school.