A woman who has embraced Islam has no Muslim male guardian.

Answer

A woman may have the right of Talaaq delegated to herself. If there is no Muslim male available, then she should write her own name in the Tafweedhut Talaaq document. When the occasion occurs, then she can opt out of the Nikah by pronouncing: "I pronounce one Talaaq Baa-in on myself."

The only reason why a male is advised is because women lack patience and react quickly in an emotional state. Afterwards they regret and cry to no avail. In Talaaq matters, one should be extremely cautious.