Thanks, everyone! She and I had a chat after school about her labor costs. I did tell her that if she isn't going to charge more than minimum wage then she can go work at McDonald's.

I think that put some things into perspective.
She has just a few orders for the holidays and we are definitely looking more toward long term if she wants to use this to earn spending money. She would definitely prefer turning pens and things to asking people "do you want fries with that?".
We are moving toward Rebecca ordering her own supplies and materials. She is pretty shy so I've been her "sales rep" so to speak but her confidence has grown and she is speaking up more for herself now. It's just getting her to understand that her skills and talents are worth more than $2-3 dollars profit per pen that I've struggled with.
The essential oil business is very big in our area and we have found that the perfume holder necklace could be a profitable item for her to sell along with pens. I priced those to give her $10 - 15 profit each and have an order for 12 already. As she has been learning, I have priced things lower and warned people that the prices will go up. If the ladies around here really want these necklaces like I've been told, those will go up another $5. We will see how that goes!
She was able to sell 10 of her earlier pens at church and raise $200 to donate for our mission team to use for hurricane relieve in Orange and Rockport, Texas. That really made her happy that she was able to use her talent to give back and some people that have been asking for pens were able to purchase a few.
She and I both like that this will allow her to earn some money but she can control how much and when she works. School needs to be #1 priority right now. If she sticks with the Robotic team at school, that is going to keep her tied up 4 days a week between January and April while they build the robot and go to competitions. Time in the garage will be very limited but that might be a time for her to build up an inventory.
As always, you have given us a lot to think about and we really appreciate all the "grandfatherly" advice. I will share with her and Ed expect another order from us soon. She has 9 or 10 roller balls to make for a friend of the family. And another friend has to decide on what kit they want for another order of 10 or so. Plus what I've requested she make for her grandparents. She will be very busy over the Thanksgiving holiday!
Thanks again!