What was it for?
Some dolls' houses were created as extravagant play-things for young children, but the remarkable condition of Uppark's example and the fact the dolls do not have articulated limbs allowing them to be posed means this is doubtful in this case.
Other 'baby houses' were intended as a teaching aid, perhaps to instruct a future lady of the house about the running of a large household. However, since many of the rooms required are missing, particularly the service areas, this also seems unlikely.
A third possibility is that the house was an elaborate curiosity, an exquisitely detailed display of wealth and taste to be admired by Sarah and her friends.
It's not clear if it was purchased as a whole or if its contents were added over time, making the acquisition of new items a pastime of its own. The copper pots and pans in the kitchen are out of scale with the rest of the house, possibly lending weight to this argument.