Tola doesn't believe that the only use of kobold women is to have baby after baby.  Just before she was of age, and probably in defiance of her mother and her promised betrothed, she went to the magic university to become apprenticed in the craft of magic.

Master Ryton sees some spark in her, and is probably very complimented that she honored the Ryton's Release spell (not to mention that she knew of it) - he has taken her as apprentice.