You're contradicting yourself.
The other 2 don't do or say anything nor do they get a minion. So by nature of the fact that she does get a minion and she does talk in away that would suggest an internal struggle I'd say that's being treated differently than the other 2.
Also .... nooooo, I wouldn't call her a case of "Necromancer ->Smn" at all. Even Edda, who you point to as an other example of Necromancer, was a conjurer before she went down that path. There is no example of a job in the game that deals with things in a manner like Necro would at all so there is not 1:1 connection to anything in the game as of rn for her ... unlike the other 2.
Like I said "Personally I find the lore dump of different types of Aether in this expac as well as Alisaie's arc regarding this topic to be criminal understated and underrated. The "Necromancer -> something else" is just a cherry ontop to me.". If that "something else" is a Witch Doctor/ Sage/ Soul Mage/ Shaman/ Aetherologist/ Esper or w/e job that plays with elements that could cross over with Necromancer to fill a darker and more spiritual role than the other mages then that would make sense to me.
Hell, even Beq Lugg looks like a creepy dark mage/ plague doctor horror thing when they fight. So if out right Necromancer is "too far" or a nope (Like Thief and Berserker) then we can get something that's parallel to that just like Rouge and War to the others.
So that's how I see it as a hint. But that's just me ... I look at all the things.
Number of DPS of each role pointing to a 4th full Caster being more likely than a 4th Ranged so soon after Dancer. (could be wrong but I do doubt they would do 2 ranged DPS in a row)
Signs that the twins will be the next to get job development in the story (1 being a caster and the other a healer)
Alisaie's whole arc with the Soul/ Mind/ Body aether lore dump and her desire to continue learning and applying what she learns on the source to help people like Ga bu.
Beq Lugg's teachings and fighting aesthetics as well as there not being a comparable job for the Necromancer from this dungeon.
The lack of a mage that hits on the darker, spiritual aesthetics.
My feeling that the devs want to focus up Smn's identity on summons and away from dots, leaving room for a dot mage proper.
I look at all this and think "Prob not necromancer but could def be something that like it that hits on those themes and aesthetics".