Sadly, there's no convincing archeological evidence for female warriors among the Viking Age Norse (the Birka skeleton is often cited as evidence, but as Professor Judith Jesch of the University of Nottingham has pointed out, the bones lacked any evidence of damage from fighting or traces of combat training). In the Sagas however, we do have tales of exceptional female warriors. But those are lone, very rare individuals in the Sagas, not masses of troops organized into fighting units. The exception is Saxo Grammaticus, but as Professor Jesch has argued, Saxo's images of women warriors derive from the legend of the Amazons from classical mythology, combined with Christian attitudes of his time, and even the popular depiction of Valkyries as female warriors would be alien to the Norse of this time period, as the role of Valkyries was to "allot death on the battlefield and serve drinks in Valhall", not fight in combat. They did not even gain a martial appearance until the Icelandic Helgi poems, and they still don't fight even then, you have to get to Saxo Grammaticus before you find anything like that. To quote Jesch one more time:
"Although Saxo's warrior women are related to the valkyries of Norse myth and legend, they represent a typically medieval view of such past beliefs. Valkyries can only turn into amazons when they are no longer a part of the belief structures of a society, although they may then represent new belief structures, in Saxo's case a typically Christian view of women. The heroic fantasy of the the protective valkyrie we find in Eddic poetry and Saxo's misogynist fantasy of warrior women may be easy enough to recognize for the products of the male imagination that they are."
Judith Jesch, Women in the Viking Age, 1991, page 180 (book available here:
https://amazon.com/Women-Viking-Age-Judith-Jesch/dp/0851153607/)
I'll also quote my favorite Viking Age blog, The Viking Answer Lady:
"...women warriors in the Viking Age are mostly myth, spurred on by folks such as Saxo Grammaticus, who as a Christian priest was aghast at the relative freedom and societal power of real-life Viking women, and so wrote many many stories about women warriors that relied much more on his classical education's references to the Greek Amazon legends than to any Viking practices. Saxo's aim was to present a woman warrior, then to create a virile hero who would defeat her with nothing but his aura of virility and manly good looks."
"Valkyries, Wish-Maidens, and Swan-Maids", Viking Answer Lady Blog,
http://www.vikinganswerlady.com/valkyrie.shtml
What I have done with Balance Mod is greatly increase the combat ability of Solveig, the female hero that seems inspired by the Sagas and Icelandic poetry. I increased her weapon proficiency by about +200 points, making her one of the most powerful combat heroes of the game. I also strengthened the upgradable female troop line substantially. The top unit in particular is now much more powerful with Balance Mod, she's now a skilled hybrid between elite slinger and shield-carrying melee troop, a role unique among all troops in the game. These units do not give any morale penalty to either christians or pagans, and women found in norse areas can be upgraded to them, meaning they include norse female warriors, as well as Saxon, Irish, and so forth. Because, setting aside the imaginings of 13th century Christian priests and 21st century television producers, there is every reason to expect that there were far more Irish and Angle women fighting in this time period than norse--women in every century have taken up arms when their homes have been attacked, and it wasn't the Norse on the receiving end of most of the violence of this time period.