That is a very good point, Lehi. In fact, in trying to understand the storyline from a linear perspective, I found that considering some missions as side stories within the larger narrative helps organize it a bit better.
In this way we can consider moments where Schneider dies as conclusions to small stories meant to explain more about the characters involved. That is not to say it makes any more sense. But, organized in this way the missions begin to take on some cohesion.
Some events, like Valeria's mind wipe, can only happen at certain points in the story because, in this instance, they also learn about the Nimrods straight away. The Nimrods are a much greater threat than a lot of the other early missions deal with, so they would logically take priority.
It is a little useless to apply logic to the missions narrative but you're right. Aneska "dying" at the end of DoW could simply be considered an ending to another side story that is not necessarily part of the larger narrative.
The only reason I would continue to doubt Aneska's appearance is because she is very loyal to Krausher. She only considered leaving Hades when they had no more enemies to fight back in the Solar System. It is Krausher's mech that she uses, not hers and she doesn't seem to think of it as hers because she basically agrees with Krausher that she could have done better with the suit.
Switching that level of loyalty around, where she could have pulled a Lycus and stole the mech but doesn't even consider it, would be a tall order. Even if Krausher is dead.
