I haven't really been active in this whole Amalia problem mainly because I find it pretty childish and useless. But w/e, here's my opinion:
She left, it was her choice. Like Ultima said, editors come and go, what's the big deal? I know I sound cruel but honestly, Amalia wasn't even that useful for the wiki, sure she welcomed users but anyone can do that (and with this I'm not saying I'm that useful either but at least I'm not acting like a drama queen). The wiki is supposed to be about the information, not the drama behind the edits, there are chat rooms and random other internet places to do that, not a wiki.
This is beginning to sound like a soup opera and there's no way this will end right. Andrewrox, I know we don't know each other at all but take the advice from an older person. Let it go. I know you feel hurt as Amalia acted like a friend before but this just proves you can't really place your entire friendship and trust on someone that you don't even know.
Amalia did wrong things in several wikis, it's just a matter of time before she does something that will get her kicked out of the sims wiki so it's better to just let things flow naturally. Now, Andrewrox, you said you liked the sims and if you plan to stay in that wiki then why just not avoid Amalia?
Those are my two cents, and I do hope this is over.