A broken hearted girl is not sad?
Well considering others…
Plus if you ignore her advances she falls for Marxus anyway.
…considers to kill off Melissa’s family
What about Duchy of Blanchard(am i got that right?) fate?
I have gone at this from multiple directions. Ranging from the “duty and vows” discussion I had with @Harian earlier. However there are other issues, she is a kindred spirit when it comes to isolation like my MC.
Yes, she spits sarcastic venom at us in what you have given so far. This behavior is similar to how abused dogs will also snap and bite at their new owners until they learn they can trust them. The affects of the abuse will never leave but they are fiercely loyal to whoever wins their trust and his/her loved ones.
Some late night, sleep deprived thoughts.
Abuse > Broken heart. Any day.
It’ll be granted to a random noble.
Well, that such a shame
why not have andus hold it for some time and when Marxus marries Melissa, andus gives the duchy to max a wedding gift?
First of all, Marxus already married Melissa. Second, Marxus will already have the Duchy of Duke Velas.
I think she’s fine as is. One of her appeals is she doesn’t have a dark past hanging over her.
But she’ll have a dark future. 
Dark past > dark future
Ugh… Wait so it’s not Duke velas the one who rebel?
There more than that school days thing?
He’ll actually die, along with his children.
When? Because he certainly are fine at wedding
Remember who we are dealing with everyone…
Natural death or…
Why not allow the MC decide perhaps gain a powerful ally ?