There is no possibility of Charlette successfully obtaining that power and then ascending to the same realm as the Demon King and Hero.
Again, for beings like Charlette, if she were truly able to take that step, she should have done so long ago. Instead of making her body approach divinity for so many years only to ultimately choose to be removed from the church herself.
She probably realized that path was unfeasible.
"Doro..."
Charlette bit her lip, "She was right."
"I can't do it..."
Doro looked at her coldly, "So what? Dying while merging with the Goddess's power should be the ultimate happiness and honor for you—you once said that the Goddess's glory was with you, didn't you? That was the whole purpose of bringing you to the Celestial Realm in the first place."