Yes, that is also part of the story. The way I see it, one of reasons why Calia might want to learn more about the forsaken is that it started with.
So you see, for me, the Forsaken weren’t monsters. They were friends. It was the Scourge, the shambling, stumbling things that wore my friends’ faces— they had become monsters.
And she acted during the Gathering based on that assumption. Yes, Sylvanas recognized that some forsaken were defecting, but, this part IMO is relevant too:
At that moment, one of the priests returned, urging her bat to go as quickly as it could. She looked shocked and sickened.
“My lady!” she gasped. “The priestess—I didn’t recognize her until her hood
fell off—I can scarce believe it—”
“Spit it out,” Sylvanas snarled, her body taut as a bowstring.
“My lady—it’s Calia Menethil!”
Her identity was revealed by one of the forsaken.
And there are more potential things that Calia might learn, and probably not like, about the forsaken. Not fantasy forsaken, like she imagined after the time spent with Alonsus, but the real ones.
Well, the devs decided that it is Calia Menethil who have to be that Light undead, so she had to die somehow. Build up is rushed, and there are still some things that make some people scratch their heads.
Also, on one hand, she should not be there. On the other, she wanted to check if she could see her family, so, she would likely do somemething emotional rather than reasonable anyway. But I definitely agree, that did not go well. And she seems to see it that way too
Calia Menethil (pre-patch):
I thought to be a bridge between the living and the undead. My first attempt ended in sorrow. But I have not given up hope, Lady Sanguinar.
Would be interesting if Voss would eventually try to get rid of Menethil… But it’s just a speculation.
gl hf