Athletes foot?

My daughter has athletes feet we have cream from the doctors, but the problem is her P E teachers demands she does gym bare footed, she is embaressed and upset by this so as a result is locking herself in the school toilets during the lesson, Athletes foot is contageous so i this right to do it bare footed, does anyone know of any shoe or sock that she could wear in gym without marling the floor, please hel from a desperate mum.