The whole "we need you as a leader sort of deal in our country" can be done so easily even without political marriages. You're the literal king just promote her to "royal advisor" or "royal tell me what the fuck I need to do for my country not to die person"
So it appears money is no object to this family, so they could incredibly easily just invest in prosthetics tech, and then the mom can get superior (to "normal") limbs, well also benefitting everyone else in the world that needs prosthetics.
I'd be going to the police with that many messages. No way in hell would I take that shit lying down. Just because it's not threatening directly doesn't mean you can't feel threatened.
Plot twist, the new fiance is either gay or ace and just doing the political marriage shit because the lady would be an excellent ruler and they needed a tie to the royal family, while the gals are just very close "friends to everyone looking on
According to the guidelines cited, Indou has yet to fail as an Officer Cadet. Asking for an explanation behind orders is not necessarily a complaint. And taking orders as absolute is what leads to war crimes, a responsible soldier questions their CO's orders from every possible angle.