The tree also shows that Anne died in 1796 which would make her a more likely mother of Dorte than the wife in the 1801 Census.
Also found the record on Ancestry.com
Anne Pedersdr in the Norway, Select Marriages, 1660-1926 Name: Anne Pedersdr Gender: Female Marriage Date: 5 apr 1779 Marriage Place: Sor Odal,Hedmark,Norway Spouse: Michel Johansen FHL Film Number: 124377
And I also found the second marriage of Michel Jansen in 1796, to Marthe Andersdatter. So the mother of Dorte who was born in 1789, must be Anne Pedersdatter.
Marthe Andersdr in the Norway, Select Marriages, 1660-1926 Name: Marthe Andersdr Gender: Female Marriage Date: 1 okt 1796 (1 Oct 1796) Marriage Place: Sor Odal,Hedmark,Norway Spouse: Mechel Johansen FHL Film Number: 124377
5th record from the bottom in the 2nd column from the left
Back to the other side of the family. Martin Engebretsen. His parents Engebret Olsen and Anne Bergersdatter were married in 1848.
Engebret Olsen in the Norway, Select Marriages, 1660-1926 Name: Engebret Olsen Gender: Male Marriage Date: 7 nov 1848 Marriage Place: Sor Odal,Hedmark,Norway Spouse: Anne Bergersdr FHL Film Number: 124378
Norway is a small country and many times families living close together ended up being closely related.
Here we have Anne Bergersdatter whose parents are likely to be Berger Jonsen and Dorthe Mikkelsdatter.
Anne Bergersen in the Norway, Select Baptisms, 1634-1927 Name: Anne Bergersen Gender: Female Birth Date: 28 nov 1822 Baptism Date: 25 des 1822 (25 Dec 1822) Baptism Place: Sor Odal,Hedmark,Norway Father: Berger Jonsen Mother: Dorte Mikkelsdr FHL Film Number: 124378
Marriage of Jon Jansen and Kari Bergersdatter, parents of Berger
John Jansen in the Norway, Select Marriages, 1660-1926 Name: John Jansen Gender: Male Marriage Date: 9 nov 1783 Marriage Place: Sor Odal,Hedmark,Norway Spouse: Kari Bergesdr FHL Film Number: 124377
Kari Bergersen in the Norway, Select Baptisms, 1634-1927 Name: Kari Bergersen Gender: Female Baptism Date: 23 aug 1761 Baptism Place: Sor Odal,Hedmark,Norway Father: Berger Stor Fullu FHL Film Number: 124377
"His sister Anne Bergersdatter born 1822 married Engebret Olsen in 1848."
Here is their marriage.
Engebret Olsen in the Norway, Select Marriages, 1660-1926 Name: Engebret Olsen Gender: Male Marriage Date: 7 nov 1848 Marriage Place: Sor Odal,Hedmark,Norway Spouse: Anne Bergersdr FHL Film Number: 124378
Engebret Olsen in the Norway, Select Baptisms, 1634-1927 Name: Engebret Olsen Gender: Male Birth Date: 9 sep 1820 Baptism Date: 8 okt 1820 (8 Oct 1820) Baptism Place: Sor Odal,Hedmark,Norway Father: Ole Olsen Mother: Mari Guldbrandsdr FHL Film Number: 124377
Johannes Bergersen in the Norway, Select Marriages, 1660-1926 Name: Johannes Bergersen Gender: Male Age: 25 Birth Date: 1830 Marriage Date: 9 aug 1855 Marriage Place: Vinger, Hedmark, Norway Father: Berger Johnsen Spouse: Thore Larsdr FHL Film Number: 307234 Reference ID: 20
You certainly have a close knit family back in Norway. Here is another of the Bergersen family that is a part of your family tree. Same parents as Anne and Berger.
Baptism of Johannes Bergersen
Johannes Bergersen in the Norway, Select Baptisms, 1634-1927 Name: Johannes Bergersen Gender: Male Birth Date: 10 mar 1830 Baptism Date: 21 mar 1830 Baptism Place: Sor Odal,Hedmark,Norway Father: Berger Johnsen Mother: Dorthe Mikkelsdr FHL Film Number: 124378
Thore Larsen in the Norway, Select Baptisms, 1634-1927 Name: Thore Larsen Gender: Female Birth Date: 23 jan 1836 Baptism Date: 14 feb 1836 Baptism Place: Sor Odal,Hedmark,Norway Father: Lars Amundsen Mother: Mari Jensdr FHL Film Number: 124378
Here is the marriage of the parents of Thore Larsdatter wife of Johannes Bergersen.
Lars Amundsen in the Norway, Select Marriages, 1660-1926 Name: Lars Amundsen Gender: Male Marriage Date: 29 okt 1835 (29 Oct 1835) Marriage Place: Sor Odal,Hedmark,Norway Spouse: Mari Jensdr FHL Film Number: 124378
Migration from Northern Europe to America via the Port of Hull, 1848-1914 - During the period 1836 - 1914 Hull developed a pivotal role in the movement of transmigrants via the UK. During this period over 2.2 million transmigrants passed through Hull. For a long period of time this was the most common route for Norwegian emigrants