I have seen this picture on facebook as well. I know for certain it's her because I remember that photo being published somewhere the first day or two that this case broke. I have no idea where it was published but when I saw the picture on fb 4 or 5 days later I said to myself, so that's who else was in that picture!! I believe they scribbled out the male who was in the picture with her in the published copy.
LE should have that picture plastered everywhere if it shows what she was wearing. Unbelievable to me if it shows her clothing she was last known to be wearing but they won't release it. That's just short of refusing to release any picture at all so the public knows who/what to look for.