I feel for you Dan. My son takes meds at school everyday too. Luckily, his is a controlled substance which requires the nurse and principle to unlock that cabinet. Both of them have to sign off on how much he gets per the rx.
Dan....lawyer up. That'* you're hammer. The school nurse or whomever gives the meds need to own this.
Lawyer...then Dr., liver function and enzymes test....go for it like it'* your daughters retirement account!
My son was tripped at school and feel on his elbow. The school nurse looked at it, gave him an aspirin (without my consent) and sent him home. My ex got home and found him asleep on the couch and hard to wake up. I went over there and saw the bruise and hauled his arse to the hospital...2 hours later he was in surgery repairing a fracture to the superior radial and ulna, near the elbow. Two plates, wire and screws later he was repaired. But, he sure didn't have to suffer for 8+ hours. The school nurse lost her job, I got policies changed in the school district and they called me "Sir" every time I walked into the school from that point on.