If it is in school, contact the school and tell them, discretely if necessary, what has happened. All schools should have procedures to deal with such incidents and hopefully it can be nipped in the bud. Give your child answers that they feel confident in giving when they are asked questions by their peers. Gently prepare them and talk to them about how they might deal with situations that might occur. Attempt to teach them to have confidence. Be open with people and answer other people’s questions if they ask about her condition.