If the hospital is looking for it, they can see it.
What was the dosage on each tablet? I hope they were only 200ngs. Even if she went to the hospital, and they did a urine test, I don't think she needs to worry about any troubles if she only took 2400mgs. Yes, thats a lot - 4x the recommended dose, and over the daily recommended, but the hospital wont know when she took them or exactly how many - just by a urine test.
Junkie