Most of that sheet looks good, LiverisGood.
The first image doesn't fit the era. Thats more around a post-industrial era (equivalent of the high times of the british empire, we'd guesstimate) from the ankles up. The part below that is something no soldier would be found wearing, as it would be far too unstable to fight in.
What sort of role does she have in the military? You mentioned something about officer and riding a horse, but you did not really say what she does. Is she one that fights in the thick of it? if so, then armor makes sense. If she's more in the background, it might make sense with somewhat lighter armoring, possibly leather-based. But no matter what role she holds, the second image is more appropriate than the first.