Uuuh...

She is bound.

Bound...?

Grudge, resentment...

Some sort of attachment is stuck in her heart.

...Do you have some regrets?

...I don't know.

She herself doesn't know what's binding her...

She must've been dead for so long she forgot.

That's to be expected if she's at the point of disappearing, but...

Attachments are the chains binding her, but at the same time they maintain her existence.

By the time she forgets them completely, she can't sustain herself anymore and disappears.

However, as long as she's even slightly bound, she's not free to leave. What a dilemma.

She's forgotten such an important memory?