I don’t recall this character.
According to the IC wiki:
Signa was the wife of Gull who appeared in a deleted scene taken from Intersecting Sagas.
Role in Brisingr
Signa was described as starved when Eragon met her. She was dying of a tumour in her stomach and her desperate husband Gull had begged Eragon to heal her. Although Eragon removed the growth, he warned Signa that she may not be able to conceive. Knowing that Eragon's intentions were noble and that she was safe, she thanked him profusely and commented on the burdens that Eragon had to carry.