Spirits' Curse
Basically, for whatever happened between where I stopped and this chapter, the now-king? have managed to get Ellen and her dad to have a talk with him.
Then he introduced his two sons.
At which point Ellen suddenly felt sick and turned away. (it's not because they're ugly, fyi)
The king mistook it as her getting bashful.
But when Ellen visibly looked worse, her dad picked her up and say they're leaving.
One of the prince moved closer, about to suggest that a sick person should lie down.
At which point, spooky scary dark mist pop out of all the royals and covered them.
Ellen could hear the voices "HELP, SAVE US" etc.
Dad took her back to spirit world, and mom carried her to bed while dad went back to explain things to the royals (mom basically told him at this point might as well explain it to them)
The tl;dr is, the current royals had no clue on why the spirits did not approach them, and thought that it's simply the spirits disliking them for what their ancestors did
Turns out: It's not that spirits DON'T come close to the royals, they CAN'T
There's souls of fallen spirits haunting the royals, and other spirits get driven mad just by being nearby, so all the spirits stay the hell away.
When the princes showed up, the aura of the 'curse' they inherited was so strong that it made Ellen sick.
On the other hand, when those fallen souls sensed Origin's power within Ellen, they reached out seeking help.