Perhaps a far-fetched idea, but did anyone consider... (SPOILER)
At the very beginning of the movie, Peer and Timo watch a loop of a dark haired girl with glasses being molested. Later on, in flashback, we see her again, both as the object of Timo's obsession and as a previous missing girl who was never located.
Am I the only one who is thinking that the missing girl/molestation victim became Timo's wife? She looks younger than him, has dark hair, and while we never see her wearing glasses, seems to have a disturbingly calm reaction to the revelation that there is child porn on his work computer. She is never referred to by her last name, but says that Timo took hers upon moving to the new city because he liked it better.
At the very least, if she is not the same girl, I think it is reasonable to take a "what's beyond" view in that Timo married her because she effectively resembled that first girl he saw in the Super 8 loops.