Sure, she should have, but that doesn't make all of the "tracing comments" necessary. One person saying it is enough. From what I remember, this is part of the reason she left. She was upset that people thought she was wasting her talent tracing. As a former friend and witness to her work, who also practices art techniques, I see some of the drawings she has done are simply practices to improve her skills. Looking at something and then puting it down on paper. I've done the same thing to enhance my knowledge on proportions. Does it mean I traced? No. It simply means I know how to look at something, whether its a photo found on google or a figurine on display, and mimick what I see.
Seriously though, for all any of you know, she could have found the photos on a random google page that doesnt credit the work which leaves her stuck on who to credit. But instead she's accused of tracing. If you guys took the time to actually look through her gallery, you'd see that there is more original works than anything, proving that she does have enough skill to know better than tracing. It's a shame to see such talent be put down because other had nothing better to do than criticize her.
And quite honestly, I have seen far more inappropriate things on this site than tracing and no one bothered to get on to them about it.