Bring her over?
That might also be a good choice, but after all, she is her mother's daughter. Durin needs to have a good talk with his mother to see what her decision is.
However, he still has time now, so Durin thinks his mother can still reconsider his sister's future—whether to leave her in the troubled Western Lands or let her follow Durin to Chang Tang, where the elders can help arrange for a better future.
As for Durin's mother in this life, Durin can understand her love for his father. She has remained single all these years, simply because she doesn't want to forget him.
Durin respects her decision because she didn't betray him, unlike the people in the stories Durin knows. She never betrayed his father; on the contrary, she even gave birth to their last child. In Durin's era, such stories were almost unheard of.
It is precisely because of this that Durin is willing to respect her decision.
