As light as the OP's chick. And no, they are not purple black shoulder. I will take new pictures tonight, but for now I will repost a picture I took a couple weeks ago of the one that I kept. I also had two males that I sold that still had no color on their necks when I sold them. I will have to look back to be sure of their age when I sold them though.
This is a purple pied hen (pretty sure I'm correct on the gender). The colors are pretty close to how they look in person. She is approximately 15 weeks in this picture. This is the lightest (in the brown area's) she has ever looked.
I realized the other picture I posted of the male purple I kept is pretty dark so I will wait to post him until I get new pictures this evening. But he is a lot darker than the OP's chick as well. I have some terrible cell phone pictures (including of the two males I sold) but for whatever reason I CANNOT get them to email to myself, so I'm sorry but I cannot post them.
Also, I'm sorry this picture is so big, I had to copy and paste it because I am on a different computer from the one that it is saved on.
Like I said, I am certainly no expert, but the OP's chick just doesn't look anything like any of my purples.
I agree that the OP's chick is a Cameo not a Purple, but I think the reddish tint in the first picture is causing some questions. Your hen is beautiful, but she has a lot of white which makes it hard to use her as a comparison with the bird in question. Did she by any chance come from PA eggs? If she did, my Purples are half sisters, that I hatched from snowshoe eggs.