The two ladies have the same oblong face...but apart from that...don't really like to say one way or the other...
I've looked for the marks on the left hand and can't find them. I think the marks on there look just another part of the botching of the rejigging of the picture.
Myself I think she has her left elbow rested on something...the arm of the chair perhaps, and the fingers are relaxed, curled under and lightly resting on the child...
Good all these ideas, aren't they.
By the way, you could look and see if you have anyone on the census returns who only had one leg....
I still can't find the other one in the original photo. There are no lumps or bumps in the frock anywhere, and if it is under the child's hand...then the child is doing the splits.