Give her the quilt. You know from your conversation with her that she would like to have one. You are pleased with her service and I believe you feel she is worthy as a person to have one of your quilts. Give it and enjoy giving it. There is zero reason to wait 6 months or a year into your business relationship to give the girl a gift. If you were wanting to give it to someone you were dating it would be a different story - someone of such short acquaintance should only be given books or other impersonal items.
There is no need to tell her what it takes to make one. If she asked you to make her one then yes, by all means, educate her. To give her one from the heart is totally different.