Here is a link that actually confirms that clitoris enlargement is a side effect of high HGH dosage.
http://www.hgh.org/Dangers-of-HGH-Supplements.html Does the HGH she is taking have anabolic steroids in it? Because it says here that if they do, then she is at risk for developing some side effects. One of which is clitoris enlargement, others include hair growth in the face, a deep voice, or irregular menstrual cycle. See if she also has these symptoms. The best bet is to just go to the doctor for a checkup.