What if Nina could win her respect, just like the MC did?
MC has the "respect" of Dragomira because he has a rather large dick
AND for being the successor to the Wellwood werewolf clan.
Both of that combined opened the door so to speak to actually prove himself as a man and not a rabid pup.
To be direct MC has not earned the respect of Dragomira yet. She is intrigued and cautiously interested, but that's it.
Nina has neither a dick - let alone a big one - nor has she a big family name.
Meaning Dragomira is not really interested in her person.
She might become it if MC is not getting involved as the pack alpha and Nina takes charge.
But even then it is doubtful she would do anything romantically. Plus at that point you would not see a throuple with Dragomira and Nina either.
Keep in mind Dragomira lived for several centuries - we don't know how many yet - and therefore is a bit oversaturated by human interaction. That is one of the reasons she appears so cold.
While theoretically possible for Nina to win Dragomiras respect the chance of that is miniscule at best.
Wouldn't hold my breath waiting for it if I were you.