Truly remarkable exposition on the subject.
The idea of 100% power is quite a thing. The only downside to the mech suit is that it requires a massive amount of Aleph to maintain itself, as we see during the fight she has to refuel regularly in order to maintain her abilities. But, this could be because she has to constantly accelerate and stay in flight to keep up with the ship.
Also, in DoW, the point is that they want to keep the ship intact but also kill the Raiders, so she cannot do what she did on Phobos. The ship is full of Aleph and is being transported to the Hecatoncheir. Krausher even says that it is more valuable than the lives of his men(or does he mean more valuable than the Raiders? I can never understand what he says). Either way. Ship has to make it or they would have just shot it out of the sky the moment the Raiders started winning.
I doubt, though, that Aneska would stay in the Hades Division for as long as she has if she were hit like that every time she gave a report. It is an emotional scene between two larger-than-life characters. Krausher is unsure of his ability to keep Hades together while also fighting a three front war. Aneska is the only trump card they have that is ever used practically. The Hecatoncheir is still being constructed. He needs her and that slap is his emotion lashing out against his inevitable fate of being stuck on the Broken Planet.
He knows Aneska is doing something no other human can do, that even he can't do, but he has to do something to feel like he is disciplining her, to keep some normalcy in their world. He knows Aneska is Hades Division's only key to survival.
I probably have read too far between the lines but that piece of lore seems to suggest, to me at least, that her reputation, her responsibility and her duty are weighing heavily on her. Thus, she shuts her eyes and drifts away "far away from everything, especially from herself."
Rather than an exhibition on how terrible her life is on a daily basis. She is a soldier, a hardened soldier with a kill count rivaling our most destructive weapons. Even if she would find offense to those things acting upon her; the slap, the chiding, the gossip and being homesick, she would not let it affect her as she has most likely been hit by worse and been called worse. I don't find it likely that someone as stoic as Aneska would get depressed from these things, to the point where she just wants to sleep.