Next day will be fun to see...
The thing about her being in a war, she's a member of a noble's army. She's not full time soldier, but a noble trained in the art of war. Circumstances led her to getting chased by orcs but that doesn't changes the fact she's first and foremost a daughter of a noble family which turned out to be militaristic to the point of having their daughters take up arms. She's a noble's daughter and weird-stiff etiquettes were also the part of their loooong list of etiquettes in noble societies...