Kaylee in Roxanne's body? Does this make sense?
Roxy and Kaylee are different souls. The two have contrasting characters. Britney knew Kaylee was gone, and nothing could bring her youngest daughter back to her.
Britney had accepted this reality and prayed for the recovery of her eldest daughter, who every day tried to find a way to commit suicide. She didn't want to lose her two daughters in a row.
Britney wished Roxy would recover so she could apologize and hear her voice again. She hoped that Roxy would forgive her and return to her usual cheery demeanor.
It didn't matter if Roxy wanted to explore this world according to her dreams. It didn't matter that Roxy didn't want to be Hades' successor. Britney never wanted her two daughters to remain in the organization, anyway.
As long as Roxy is willing to listen to her, as long as Roxy's health improves, Britney is willing to accept any punishment.
But… not this kind of punishment.