My tears.
I swear if the first princess does anyone to the Second Royal Guard-
I... I can't do anything, but I swear. I will swear.
A Girl should hope to the Goddess Above that A Girl does not get poisoned in her sleep by her sisters...
Unlikely, thankfully. The first princess deeply cherishes the little shit, but her reputation, demeanor and the rampantly backstabby courtly intriques prevent this from being shown, either to the other two in the royal family or to the wider public.
The mom (queen) is busy trying to keep both of her dear daughters alive by reinforcing the succession by placing the more formidable elder sister on the forefront while keeping back the younger's status/validity, so that there'd be less reason for her to die in an already set power struggle. The elder sister tries her best to achieve and intimidate to make it all a foregone conclusion, so that either her mother or the related royal factions would have less reason to "help" her succeed by taking care of the
spare. The yougest is terrified of them both for the otherwise very valid reason of her being a potential liability to a stable succession. All three seem to love each other, but have reasons to not stress this and therefore woefully misunderstant the other two. Kind of like the three way(?) misunderstanding resolved in this chapter.
...Man, this story is having a field day with interpersonal misommunication

.