Hair styles come and go. My guess is that this was the lastest "avant garde" fashion. She obviously has every hair in place.
This image is from an original tintype photograph which was scanned, emailed to me, and restored in 2005. The tintype image measures 2-1/4"x3-5/8".
full exif
Hey Cliff! Donna DuRee here. My grandma was Martha Pearl MacKenzie, married to Percy E. Johnston, and this isn't her. I will send you a pic. as soon as I can. Martha was born in 1893, so would have been about 17 here, and the pics I have of her in 1912 show a pretty, young, smaller lady that does not resemble this picture at all. Maybe this one was mis-labeled? I will try to scan some to you today.