I think she would come in with the advantage of a perceived neutrality between warring partners—in a lot of cases, but not exclusively. I think she'll come in with the respect for civilian institutions and the dominance of the civilian parts of the population, as opposed to a predominantly militaristic authoritarian structure. We would have trained her in how to function effectively as a staff officer, or to be a leader as a non-commissioned member.
She would be given at least the familiarization, if not extensive training, in the use of technology; the importance of understanding the population; the importance of reaching out to disenfranchised members of the population, such as the female population, child soldiers, minorities; as well as an understanding of how to communicate effectively. She would back it up with a level of fitness, mental toughness and regard for law that would allow her to enforce any regulations ruthlessly but appropriately.