My Soul To Take

Now I lay me down to sleep,
I pray the Lord my soul to keep,
If I should die before I wake,
I pray the Lord my soul to take.
Lucifer has plans for Katla, a purpose she can fulfill. Her soul taken from her in a deal made with a demon, she's dragged to Hell. Katla is given a chance to reclaim the ownership of her soul and escape Hell, through trials and tribulations of The Seven Deadly Sins.
The question...
...why even allow her a chance to reclaim what is hers and escape Hell if Lucifer needs her?
Will she fall or rise?