You can train Spirituality (without an advisor) before meeting Ethexae. One day’s worth of lessons goes a long way towards knowing what the right options should be.
For the initial check, you remember that you might be able to approach her as an equal as Empress, but for now, you need to be submissive/supplicative.
I always have Basic Spirituality when meeting Ethexae, and that's specifically why I find the wording in this choice unclear : the successful check's information doesn't fit in with either choice.
I'm more likely to kneel if I don't have the check's information, because in that case I haven't discovered information that tells me that kneeling isn't considered culturally appropriate from the Imperial heir.
I would suggest either rewording "kneel" to "bow" or offer a third, correct option if Zorana passed the check.
ETA or simply rewording "you are expected to bow your head" for something slightly less specific, such as "you are expected to show deference", something to indicate that any outward sign of respect is better than treating her like an equal.
