Spoiler:
This was talked about a while back and all
Actually, Aseph matches with her seal.
She and aseph are fated soulmates. And she was also originally from their timeline. But drama happened, and some stuff regarding their past lives, how she also kept dying to save him that her soul fragmented so the God moved her to another world. Aseph also sold his soul to the devil in the previous lives hence why his seal doesn't show up in this life.
And previously, how aseph had felt attracted to the sister in the other timeline zay had read about, it was suppose to be zay but since she had "died", it went towards the sister.

I think her seal is unique and given to her by the goddess, marking her as the goddesses child. And I dont think anyone's going to match her seal. I mean in every scenario she chooses to save him even tho the goddess gives alger chances NOT to. I mean it that's not fate...then what is.