*daughter of Swein (of Mercia?)

father (possibly):
*Swein Godwinsson Earl of Mercia
born about 1021/24
died 29 September 1052 Lycia, Constantinople, Byzantium

mother:
*Edwina Abbess of Leominster
(end of information).

siblings:
Tostig of Mercia
Haakon of Mercia

spouse:
*Reginald Thorkellsson 1st Earl of Crawford
born 1034 England
died 1069 Crawford Lands, Lanarkshire, Scotland

children:
*Galfridus de Crawford
born 1067 Eade House Castle, Renfrewshire, Scotland

biographical and/or anecdotal:

notes or source:
LDS
ancestry.com
This is speculation since all the records refer to a Miss Swane.
At the time of Canute England was divided under four earldoms of which two adjacent were
Mercia and Anglia. *Thorkell of Denmark was Earl of East Anglia and *Swein Godwinsson
was Earl of Mercia. As was the custom of the time their children would have married.
And all the dates match well. You heard it here first.