 Shelby Corcoran ( Idina Menzel ) — Rachel 's biological mother , the adoptive mother of Quinn ( Dianna Agron ) and Puck 's daughter Beth , and the former coach of rival glee club Vocal Adrenaline — is <unk> to coach a second glee club at McKinley High financed by Sugar <unk> 's ( Vanessa <unk> ) wealthy and <unk> father . Shelby reaches out to Rachel , Puck and Quinn . She lets Puck see Beth , but rejects Quinn 's desire to do likewise due to Quinn 's bad @-@ girl attitude , appearance and behavior . <unk> coach Sue Sylvester ( Jane Lynch ) , who is running for Congress , convinces Quinn to feature in an anti @-@ arts video for her campaign . In it , Quinn confronts Will and blames him for her transformation into a bad girl , but Will <unk> her , reminds her of how the glee club and its members have always supported her in the past and tells her to grow up . After seeing a picture of a happy Beth and Puck , Quinn breaks down . She resumes her normal appearance , and Will and the New Directions welcome her back into the club . Puck tells Quinn he is proud of her , but Quinn reveals she is only pretending to behave in order to take Beth back from Shelby , and intends to pursue full custody . 
