Princess Josephine of Baden, wife of Prince Karl Anton:

I was thinking it reminded me of Louise

The styling and clothing just seemed off for Josephine to me and reminded me of Louise. Even though they weren't close blood relations, I think they looked very similar! Plus, it's easier with portraits than with photographs to have a bit of artistic license. I guess it is Josephine though.
Veronica--thank you for the photo of Josephine. That's the one I wanted to find for a comparison but didn't have time to do much in-depth searching yesterday.