Niels Anderson's 4th Wife-Christi Olsdatter

Niels Anderson married Sigri Torkildsdatter, then Guri Torklidsdatter, then Onni Torlidsdatter, and then Christi Olsdatter ( 23 Jun 1817). There are appoximately 10 children with the eldest (Anders about 25) when Niels Anderson dies (23 Sep 1828). Is there any record that Christi Olsdatter Anderson marries again? If not, can you tell me the custom of how a widow with several children survived? Once again, I thank you and appreciate all of your help.