She's just doing her job. My last executive officer was a captain, a black lady. She got shit done. VERY professional. Asked me to mentor her, which I gladly did. She put on my retirement ceremony. She could have worked for me any time, anywhere.
Being a drill sergeant/drill instructor/military training instructor is one of the hardest jobs in the military. Enlisted people go through basic training once. Your drill sergeants go through basic training every X number of weeks. They go through a tough training school and must work within frequently-changing regulations and directives. These drill sergeants are evaluated on the job by more senior drill sergeants, their first sergeant, and sometimes their commanding officers.
They have the job of taking largely undisciplined civilians and turning them into soldiers, sailors, airmen, Marines, Space Force Guardsmen, and Coast Guardsmen. Those who are out there "pushing troops" can work hellacious hours, always expected to be perfectly groomed and look great in their uniforms. Drill sergeants can change uniforms several times a day on a hot day. They'll get the salt stains out of their campaign hats by putting a little rubbing alcohol on the stains, which brings up the salt to be brushed off. These men and women have to be able to handle any emergency a trainee has at any time. You can bet many, if not most drill sergeants, have had to deal with a recruit harming themselves or even committing suicide to get out of the military.
Not all drill sergeants are volunteers. Some can be put into the job involuntarily, making things even less pleasant. This lady may not have wanted to be a drill sergeant. Not all drill sergeants finish their tour successfully, for various reasons. That's one job I sure wouldn't have wanted to do. I was an instructor for several years, but an academic instructor. MUCH different, even though I wore the same instructor "cookie" on my uniform as a military training instructor. About the only places in the Air Force where you might see officers as military training instructors would be Officer Training School and the indoctrination schools for Medical Corps/Dental Corps/Judge Advocate General Corps/Chaplain Corps. But you would also have NCO military training instructors there, too.