Secretly collect hair every time you get a haircut. Keep it in a bag.
When you have enough, use the hair and scrap corn husks to make a doll.
Place the doll on an altar worshipping Groomu, The Hair God.
During a full moon, bleed upon the effigy to appease Groomu, and if done to His satisfaction, He’ll grant you a boon.
Use your boon to ask Groomu what you should get her as a present.