I've said it before and I'll say it again.
The prologue was made before the entire EA story was really fully realized. It's outdated. But still a part of the overall plot, art aside.
So yah. She looks much different in the prologue. That's to be expected. It was done quite some time ago.
If I were to redo it (something I've been scheming to do for a while now), she would look like how she is being presented in these new pages. Well. Only a tad more irritable.
Actually, y'know what, lemme make a separate post about this..