My dad has an M.A. in political science. He's woefully unqualified to lecture on military affairs.
The ROTC program is an entry-level training program intended to qualify cadets for the most junior of officer ranks. If you're going to go that route, you should probably stick with "she got promoted to Lieutenant Colonel". That at least would include not only her "undergraduate" work, but also her service experience and professional development accrued since then.
I don't doubt that she's more qualified than others to lecture on certain aspects of the military. Not everybody can say what it's like to be shot down. Not everybody is in a position to offer feedback about how the military treats its wounded, and cares for them through the recovery and discharge process.
But the whole premise behind having a civilian commander in chief, and having civilian legislative oversight of the military, is that military service or training is not necessary to be qualified to reason and have opinions about military matters.