Hi Nikki
Yes I'd agree that there are a lot of similarities between your great granny and the lady in the photo. Unfortunately all the information I have on this photo comes from the suggestions in this thread, as I found it in a collection of hundreds of photos from my grandparents and it unfortunately had nothing written on the back.
For some reason, I've always suspected that the man on the extreme right, without the glasses, is a relative. Annoyingly I have no proof of this, but a few branches of the family worked in the mills at various times and I just have a feeling about him.
One possibility is someone who worked at Ward Foundry, but he died in 1913 and I have no photos of him to compare to this one. I was hoping that this thread would help me to discover the date when and place where the photo was taken so that I could perhaps confirm whether this could be the man in question.
Do you know which mill your great granny worked in?