From A Wiki of Ice and Fire
|Book(s)|| A Clash of Kings (Mentioned)|
A Storm of Swords (Appears)
Shirei Frey is the (supposed) seventh daughter of Lord Walder Frey. She is the second born daughter of Lord Walder Frey and his seventh spouse, Lady Annara Farring. However according to Merrett Frey, Black Walder Frey was rumored to be sleeping with Lady Annara casting doubts on the parentage of her children. Shirei is the youngest daughter of Lord Walder Frey.
A Storm of Swords