It would really more play into the fact going back to "civilian" life would be extremely difficult for her. Unlike Luna, who had her old job and routine of patrolling the night to go back to, Tempest was a part of the Storm King's army since she was a filly, which means she never completed her education and has no grasp of current Equestrian society. Keeping her in some kind of military role would be the best thing for her, really...