I'm sure I'm kicking a long-dead horse, but it probably depends on how your group is defining evil in the campaign. From what you describe above, I don't think your character is going to be sprouting a halo anytime soon- she's just not being over-the-top ridiculous about her alignment. To my mind, an evil character is just selfish, motivated mainly by gain, and more prone to do things that non-evil people wouldn't- such as torture or the death of innocents for personal gain. You can still have a code of honor, as shown by the lawful alignment- just because the character won't kill children doesn't mean that she isn't capabale of equally evil acts. It just means that she won't kill children, for whatever reason.
I think it mainly comes down to the PC/NPC role- evil NPCs are villains are supposed to be the sort of Dr. Evil "E-vill" and do things like kidnap princesses, put villages to the flame, attempt to destroy the world from their secret volcano hideouts, etc. I think PCs would fall more into an amoral/pragmatic version of evil- they wouldn't be quite as active about it, more opportunistic.
It seems to me that your character is just being pragmatic about things- why attack people you aren't paid to? You're just making more enemies and risking yourself without profit. Why kill the children when it's just going to make you look bad with your party members? Even if you don't buy into all their high morals, you still need them to watch your back from time to time. Essentially, I just think evil PCs should have better motivations than killing anyone they find, and the character sounds fine the way she is to me.
Of course, I'm not your DM (and, in fact, I generally don't allow evil PCs in my game, but that's another topic). If you think your DM may force you to switch alignments and you'll loose some abilities, then you should probably talk to them about what you're doing with the character and make sure that you both understand how the character is evil. That way there won't be any unpleasant surprises for anyone.