@AFresherPerspective yeah, cause morals and ethics as a whole have progressed to where most societies understand that it's cruel to do that to children. But shit like this happened often enough throughout history.
@Kanol from the perspective of a near medieval to pre renaissance knight, it doesn't matter if they showed her directly or not. The master or mistress' dignity was threatened, on top of a person with unknown heritage was now not only touching her but grasping his arm around her waist, an amount of intimacy reserved for husbands and their wives.
@flannan Ducal houses tended to have blood ties with the royal family of their nation. The ducal rank is high enough that other than rewarding a house for generations of serving the royal family and piling achievements after achievements, it was bestowed upon non-direct successors to the royal family, such as brothers or cousins. Setting that aside however, lese majeste can still be applied to nobility in general, with justifications varying in real life depending on the nation.
And even if she did lose noble priveleges, she is an "oracle priestess", important enough to the temple that her escort is not only eight knights but 300 soldiers, a small army. Hell last chapter Satou mentioned that it's entirely possible for those soldiers to siege the Munro capital and take it. Her status was important enough that it required the Head Priestess or Holy Woman (Saintess could be another translation) to approve of her going to the Munro barony, along with the extra priests and army as an escort.
Finally while that girl is a temple knight, part of the reason why the Tenion temple sent the oracle in the first place was to help restore public order (previous chapter), which by extension include social order. Edit: And I missed this the first time around but the Temple Knights aren't strictly limited to protecting only the temple, Sera refers to the previous senior ones as being Imperial Knights who protect the Duke, along with being Temple Knights who protect the temple.