On February 15, 2015, Tropical Connection Company, a garden retailer, purchased $25,000 of seed, terms 2/10, n/30,

Question:

On February 15, 2015, Tropical Connection Company, a garden retailer, purchased $25,000 of seed, terms 2/10, n/30, from Midwest Seed Co. Although the discount period had expired, Lydia DeLay subtracted the discount of $500 when she processed the documents for payment on March 16, 2015.
Discuss whether Lydia DeLay behaved in a professional manner by subtracting the discount, after the discount period had expired.