The character is in the second stage of soul loss.
Persistent Condition
Resolution: This Condition is only removed if the character regains her soul.
Beat: You lose a dot of Willpower
Her instinctive efforts to shore up her Willpower by giving into her urges have failed, her Integrity has gone, and her Willpower is now fading
In addition to the effects of Soulless, she can no longer regain Willpower through her Virtue, only her Vice.
Indulging herself brings diminishing returns — whenever she does so, her permanent Willpower drops by one dot before she regains Willpower points to the new maximum. Mages lose a dot of Gnosis every time their Willpower drops, to a minimum of 0.