I have a Johanne Marie Nielsen in my line who was born in Lengo, Helsinge, Fredericksburg, Denmark in 1855. It sound very similar to the Johanne Marie Nielsen that you have described. Her parents were Niels Nielsen Carpenter (b.1824) and Petronille Johansen (b. 1818). I have the names and birthdates of her siblings. Her family seems to have come from Villingerod, Esponderup, Denmark. I do not have the names of her husband or children. Do you have more information on her?