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 headhunted to coach a second glee club at McKinley High financed by Sugar Motta 's ( Vanessa Lengies ) wealthy and doting father . Shelby reach out to Rachel , Puck and Quinn . She let Puck see Beth , but reject Quinn 's desire to do likewise due to Quinn 's bad @-@ girl attitude , appearance and behavior . Cheerleading coach Sue Sylvester ( Jane Lynch ) , who is running for Congress , convince Quinn to feature in an anti @-@ arts video for her campaign . In it , Quinn confronts Will and blame him for her transformation into a bad girl , but Will reprimand her , remind her of how the glee club and its members have always supported her in the past and tell her to grow up . After seeing a picture of a happy Beth and Puck , Quinn break down . She resume her normal appearance , and Will and the New Directions welcome her back into the club . Puck tell Quinn he is proud of her , but Quinn reveal she is only pretending to behave in order to take Beth back from Shelby , and intend to pursue full custody .