Reading the manga, I would say that she's far from angelic. She comes across as being too darn extreme in just about everything she does. I understand that many of the actions in the manga itself is probably exaggerated for comedy's sake, but still...blowing up a bus when she could just have readily grabbed Keitaro and carted him out of danger zone? In fact, I was wondering if Motoko ran away paritally to escape her domineering ways? In a way, she is as much intimidated by her elder sister as much as she looks up to her.
And nice update, by the way.