since you already have the good ending, you already know how to meet her and get her ending.
this is after you've done all the choices to get to this point, just like how you get the good ending but if you do this for her bad ending, you're basically scaring her instead of helping her.(T⌓T)
this is for her fail ending:
1st option:
"I'm sure with your dark magic, we'll be safe."
2nd option:
"Don't worry, I'll protect you!"
3rd option:
"Watch out there's a spider!"
4th option:
"Tell a story about a ferocious beast in a labyrinth"
5th option:
"If you're scared, you can hold my hand."