Definitely not 1860s, early or otherwise....dress styles, hair, and pose are way wrong for the 1860s.
There's a similarity between the girl and the single portrait you posted, but it's not the same woman. Her ears, which do not change over a lifetime except for the length of the lobes, do not match the girl's. This portrait is mid-late 1890s by the way.
Cheers,
China