Nature always needs a balance.
What if Qetsiyah (or Tessa) ressurecting herself was the true reason Bonnie died in Graduation.
I was thinking maybe Bonnie might have suffered consequences from bringing Jeremy back but maybe not resulting her death like when she lost her power ressurrecting Jeremy the last time or something like that.
Qetsiyah is more of Bonnies' Equal, power-wise, and therefore more apporpriate to be her 'Balance'. What's more they are blood-related and there's why no one else but bonnie could take her place on the other side.
I know she could have just possessed someone else like esther did but given her talents (immortality spell & other side creation), i'd say she's more than capable of full ressurection but at a cost. Of course, if she was so powerful, maybe she didn't need that balance and maybe so does bonnie. Then again, she is shown to be a crazy & vengenful b*tch who wouldn't let anyone stand in her way, who's to say she wouldn't sacrifice her own decendent for revenge.