Squirrel is a wildling spearwife. She gained the name Squirrel for her natural climbing skills. She has brown hair.
A Dance with Dragons
She accompanies Mance Rayder along with five other spearwives to Winterfell on a mission to free "Arya Stark" (the girl is actually Jeyne Poole) who is to wed Ramsay Snow. Mance disguises himsefl as "Abel", a singer and the six spearwives are his mother, wife, two daughters and two sisters who perform the instruments with him. She is one of the daughters.
They play at the wedding feast and are responsible for the deaths of several Bolton men at arms. They later enlist the help of a reluctant and fearful Theon Greyjoy in freeing Jeyne. The six spearwives disguised themselves as maids and accompanied by Greyjoy walk into Jeyne's room under the pretext of bringing hot water so Jeyne can have a bath. Squirrel switches clothes with Jeyne so Jeyne can leave disguised as a maid with the other five while Squirrel climbs down the tower once they are gone. According to a letter Ramsay sent to Jon Snow on the Wall, Mance was captured and now wears the skins of the six women who accompanied him to Winterfell.