The woman's first comment was about whether the studio cheaped out and hired kids.That could actually be a point against Hinata. You're coming at this from a political angle and while this particular point should be a plus, it's only a sure thing on paper.
I'm saying that ego is very much a factor, even if she won't admit it.
And compared to that, Karin lacks the temperament for tact entirely, as well as the training, which seems to be an Uzumaki thing.Considering that this woman got ran out of her house and home, lost her family, had to change her name and spent the last decade (or so) on the run because of the games of the nobility... Hinata's regal disposition might rub her the wrong way.
It might remind her too much of her childhood, too much of herself at one point in her life and I don't think it's unreasonable to think that Koyuki would lash out at someone that made her uncomfortable on such a raw level.
And she doesn't have Talk no Jutsu to compensate.
And Hisana is one of only two survivors of a famous family massacre.
By one of her own clan members at that, which draws uncomfortable parallels with Yukie's family getting murdered by her uncle for power.
If we're worried about rubbing her the wrong way, we most certainly don't want Hisana playing close protection.
She's about to go into a very stressful situation.Only if she's willing to open up. That woman has been a closed book for a long time.
That conversation could definitely happen, should definitely happen. It'd be good for them both relate as they can over being/feeling powerless.
But that requires emotional honesty from someone who's really not in the mood for that, at the moment.
One she isn't trained for. I don't expect her to be any better at hiding her feelings now than she was in canon.
Unless she's been eaten and impersonated by a Zetsu.
/conspiracy theory