If Ashi felt Aku leave her, why did it take so long for her to...

Disappear?

This makes no sense to me. Ashi felt Aku leave her. Yet she continued to exist...

Could it just be that she still exists, in the future, just without Aku's presence? She could have still been born, after all. Just not through Aku magic.

Gotta get back. Back to the future?