well lore based you're right about that ,the beloved thing and all that,she "loves" the MC and only him for her entire life.
that said it won't change her personallity,so far she's shown a sadistic/dominant approach,now it remains to be seen if that a cultural thing or own traits as well.
we'll see her again,im 100% sure on that,as for being a LI,i think she'll do something to somehow save/prop up the MC(possibly by her own design) so he ends up indebted to her.
she was Heir,so now she's Queen of the winter Fae so she has a lot off ways to do things.
as a result the MC might up with a "breeder" contract like with Sarah,but more because to pay his debt than actual love.
just my idea on how it will go with her though,vanderer might approach it entirely in a different way,and likely will because this scenario pretty much ignores all the other relationships & politics.