Dying wasn't part of the plan.
Ariadne's plan was: help her husband, Dionysus get recognized as a god by his father and accepted on Olympus. Her husband elevates her with him, making her a goddess. Simple.
But then she dies. Critically, before her husband is recognized as a god.
It turns out the dead are terrible gossips, and the rumors coming in about her husband are starting to get ugly...