Except for the fact that they're not living human beings, these dolls are so much like actual babies.
I'm not sure what to make of this, and the motivations seem to be mixed. The second woman, with her own children and grandchildren, seems to be just playing with dolls - a strange hobby for an adult woman, but still a hobby. The childless woman who says it makes her feel like a mother - I don't know.
The childless woman I can understand some. It reminds me of the women in the book “Children of Men”.
The woman who did that for an actual grandchild, I would recommend keeping the child as far from her as possible. She would cause mental harm to the child’s development by denying it should occur.