Stewart has spent the past 20 years working for the Scottish red meat industry and is said to have played a pivotal role in promoting exports of Scotch Beef and Scotch Lamb.
Stewart said she was “delighted, but completely taken by surprise” with the news of the honour.
She joined QMS’ predecessor, the Scottish Quality Beef and Lamb Association, in 1990 and has worked as an administrative assistant and an export promotions manager
QMS chair Donald Biggar said: “During the period when beef exports were banned, Margaret worked tirelessly to nurture and develop contact with former customers of Scottish-based exporting meat plants.
"A lot of the success that the Scottish red meat industry is experiencing now can be attributed to her determination to maintain those valuable relationships when exports were not possible.”
From 2001, Stewart has worked as a QMS marketing manager and, in her current role, she also looks after the foodservice sector and played a leading role in setting up the Scotch Beef Club.