So I'm trying to figure out when exactly Ella's behavior changed to be more malicious. What we see in the MC's flashbacks in this latest update seem to indicate that Ella was still unnerved about everything after becoming a superhuman. Yet in Cole's flashbacks, Ella seems to be very in control and haughty. I'm not sure what changed, nor when it happened.
EDIT: There's also the curious fact that Ella's didn't undergo any physical changes as a result of becoming a superhuman like the MC did. I wonder how she lost her scars then.
Well, the flashback is the morning right after Ella was infected. I'd guess that her misanthropy didn't come until Tanos realized she was his most successful experiment and made her his "favorite". I can see the combination of superficial affection and horrific medical experimentation that Tanos brings to a relationship souring a person on humanity really fast. Probably why she acts so in control, too, showing fear around Tanos wouldn't end well. Throw in the 3rd and 4th communicating with her, too, having dark gods whispering to you of your grand purpose can't be good for empathy.
As for her physical changes, maybe it's because she was still growing. The physical changes are supposed to be like an idealized development, so if she was developing normally it might have just piggybacked on that process instead of doing it all at once. And the scars...come to think of it, have we ever seen becoming a superhuman heal scars? They didn't heal the MC's, they didn't heal Michael's, they didn't heal Ella's. Maybe the healing you get when you ascend just leaves scars alone.