She was poor in Math but now a Doctor?

I just hope she won't get confused with the prescriptions she gives out to her patients. Like the difference of "ml" from "mg".
ML (milliliters) use to measure liquid volume. e.g. 5ml = 1 tsp.
MG (milligrams) use to measure weight. (1,000 of a gram)
Very small amounts of medicine in a mixture.
e.g. 10 mg of active ingredient in a pill.