I think with the in house sales you should pay a flat hourly rate, say 9 bucks a hour. when she is not busy have her making phone calls and pay commission on all those sales. I do it like blue building my contract pricing into every order so no matter what, we get paid for our printing. so after garment cost, printing, freight( if any). the balance is split 50/50 with outside sales and 70/30 if she is doing them on the clock. doing it that way you really dont care what she bids it at because she will make no commission if its low balled but you will make what you would on a contract job. hopefully your getting 50% deposits so your cash really isnt tied up in garments either. I dont pay commission on art and screen charges either.