How Could I, Bound to the Savior's Daughter, Be the World-Destroying Boss?

Ling Qi transmigrates into a magical girl anime she watched in a previous life and gains a binding System. She can bind one target and gain the same magical power as that target. So, using her memories, Ling Qi binds the strongest savior, the one who will save the world, and becomes the mother of a girl five years younger than the savior. At last, Ling Qi waits for the day the savior awakens her powers, eagerly preparing to awaken as a magical girl herself. [The savior awakens as a light-element magical girl and learns the ability Light Healing.] [You have successfully awakened as a ??-element magical girl and comprehended the Corpse Creation spell.] Although her awakened ability is a little strange, Ling Qi decides to use this power to protect her daughter and the world. …"Demon, you've killed so many people. Today, I'll rid the world of you!" "You can't kill me." Standing atop the villain's corpse, magical girl Ling Qi looks at her savior daughter below, sword raised against her, and sighs. "Why? Who do you think you are?!" "I'm your mom." "????"