Send her away. Of course! Brilliant!!! Send her away in a state, in which she is disappointed in you. There is no way, that she, your own heir, might return as an enemy. I just want to beat some sense into Souvel.
@Cliff: Oh. Okay. Yepp, I concure with our post. I felt, that Hero-brother actually wanted to give Loser-brother a good advice, but after reading you post I feel, that he actually didn't go far enough. 'My brothers family is about to fall apart.' "Maybe she wanted to tell you something important?" 'Yepp, I did good. Now it's out of my hands.' Well, he could have done more. This is a good situation to get meddlesome.
On one side I do get, that Souvel is troubled by everything that is happening right now in his fief and from his POV his daughter might have tried to just throw a fit. But on the other side he KNOWS she feels isolated and he send her away to the person (his wife) he either didn't bother to visit for some time or knows, that she isn't on the top of her game right now. He even wants to send her away from the mansion. Well, maybe it really is the best for her to get send away from those fuck-ups, before they damage her any further.
Also. Everybody is showering MC in love and is taking a piss on Souvel's daughter. As Cliff pointed out that grandma is a fine example. She loves one of her grandchildren, but distances herself from the other.
Laffilia is in distraught, because she doesn't know, why she is kept in such a bad place. And there is no good reason for her being treated that way. And the two persons, who should be in charge of protecting her, don't take any steps. And everyone else is looking away. MC who might do something about it is kept out of the loop...That drama is over the top and feels bad. The "bad kind of writing"-feeling. It feels too forced. And it is too obvious why those things are happening...
Being Laffilia is suffering. And after suffering comes hatred. And as MC is loved by everyone and she is not, its not hard to see, who the target of that hatred is going to be.