What are the other factors you are relying on for the 1914 date? The conclusion made is that the well had been already abandoned at the time of her death, which sets the date
after 1914. Also, prior to WW1, black was considered a colour of death & mourning, so women avoided wearing black. However, fashion during and after WW1 brought black into play as a fashionable colour, thus would not be unusual to then be worn by a classy, in-fashion woman. Her dress's hemline seems a little too high for 1914, also. Add that she may have been wearing clothing that was not newly purchased that year, so may not have been an accurate depiction of "current fashion" at the time. However, I think that line of thought may be entirely moot!
I have been wondering, and now am quite doubtful that the clothing shown on "The Doe Network" is the actual clothing she was found in. Considering the conditions in which her remains were found, it is nearly impossible that those were the very garments she was wearing. Clothing from that period does not survive well in those sorts of conditions. I have had clothing that was stored in far better conditions and were in nowhere near as nice condition. The photo of the clothing seems to be in a museum setting, also. Seeing the actual garments, method of manufacture, fabrics, potential maker's tags, and other features would certainly make things much easier. The "necklace" shown is a locket, so there would most certainly have been a photograph, lock of hair, or even a folded up letter, newspaper clipping, souvenir, trinket and/or other evidence to be found inside. It also likely has markings, in the least a makers mark, and if it is gold, it will have hallmarks indicating the purity of gold, and if European, the date and area where it was manufactured. If American, we should be able to date it relatively accurately, also.
The hairstyle in the recreation, if accurate, was common in the teens. It was called "A bob". By the 1920s styles changed. But, hair being what it is, and possibly the reason your great-grandmother had that style, some people stuck with older styles even when they were no longer
in style, and, Canada was also a little behind as far as fashion and hairstyles used by the general public on the prairies. So, hairstyle, nor clothing can be a definite indication of date, other than giving us a starting point as to when it came into style....which was WW1..so at least 1914, but likely a year or more later.
A much clearer picture of the locket would help, IF that is even the actual chain and locket. have you seen anywhere online that shows better photos? I have contacted the Saskatoon Police's Historic Crimes unit with the photo, my interest in the case, etc, but I have not heard back from them as of yet.
