In all honesty Alex doesn't use amour cause I ran out of skill spots, I had to but the sciemtar on minor even though originally it was going to be her signature weapon.

How I would classify her...

Lonely, she takes things to fill the hole in her heart caused by feeling like nobody would care if she turned up face down in a ditch. After her sister died it just got worse, then it was a means to stay alive, now she feels the need to steal to satisfy her sister's last words "Live your life sis". Even all these years later Alex is still grieving.

Though as I write this it occurs to me that you wanted a generalized four word description. 

I'd go with traditional rouge. Her moral compass is severly skewed though she does have her code.