Answer: Lateral cycling
Explanation: Lateral recycling is the technique through which the previously bought products or items are exchanged with others for some other goods or item and it can also be sold.
The items which are not in use of the seller is usually sold in this type of sale .Thus, the items are bought by people who require them and in this manner items get recycled.
According to the mentioned situation,Stephanie is indulged in lateral recycling by selling the products she bought from sale for recycling purpose and eliminating the items that are useless for her.