"... we have decided to transform you into a dog."
"What?!" exclaimed Kat, "You don't have to do that. Without my powers, I'm just like any mortal girl. I can't hurt you."
"You've hurt me deeper than a few beginner, Kat," said Janice. "I was your mother, and look what you tried to do to me, what you actually did to your brother."
"And even as a non-magical human, who's to say you won't kill again?" added Margaret.
"I'll say it! I won't! I promise. Give me a chance. If I even look mean at a fly, you can punish me," Kat pleaded. Margaret only shook her head and said, "I don't think you realize, we already have to punish you. What would other witches say about our family if they let this slide?"
Kat answered, "Who cares what they think?" She turned to Janice and said, "Come on mom, we're family!"
"DON'T say that like you can just assume it's true!" Janice yelled in tears. "We could easily turn you into a man and strand you as a hopeless nobody somewhere. This is the only way I'm willing to give you a chance to stay with our family. As a pet who'll gradually forget magic and eventually most of her human life anyway."
A chill went through Kat as she realized the depth of what was being proposed. "Then why even keep me around anyway?" she whispered. Janice covered her eyes with a hand. Margaret patted Janice's back. Janice finally spoke: "Because I saw Dan's eyes when I told him we were planning to bind you. Even after all you've done, a part of him forgives you. He doesn't want to lose you. You're not a sister, but maybe as a family dog you can learn to love us for real this time."
Kat had to choke back a few tears at that revelation. Could it be that even Dan really cared for her all along? But still, to be transformed like this ... Sure, her mother and grandmother could transform into animals and back, and they'd always intended to teach Kat that, but this was different. She was a non-magical person getting changed by witches. She'd lost her magic and was about to lose her humanity. And she would be helpless on her own to get it back.
"Please," she dropped to her knees and begged, "I've spend 18 years becoming a woman. Don't take that away me."
"I'm sorry honey, but you've already taken it away from yourself," cried Janice. Margaret stepped out from behind her and sneered, "You're getting pretty good at begging, though, Kat. It won't win back your magic or your humanity but it might earn you some table scraps if you're a good girl."