Hello: My Girlfriend Pissed Hot For Cocaine This Morning In

Hello: My girlfriend pissed hot for cocaine this morning in a ready cup. I know she has not done any kind of non-prescription drug period in at least 3 months and has consumed 0 alcohol. She is taking Levothyroxine for hypothyroidism and Alprazolam for anxiety. What other reasons would cause a false positive for cocaine 2 times. I know for a fact she is 100% clean.