Erica's explanation

A few moments later, Azaroth finished stating his demands. When Erica heard those demands, she was startled.

She had been expecting Azaroth to use that threat and have some excessive demands. If that occurred, she was willing to bet her life and kill him.

Azaroth also knew that even if he could normally handle a 6 Star Expert, if Erica really wanted to kill him while betting her own life, then he might truly be killed.

However, she was caught in a dilemma. The demands Azaroth presented were nothing to Erica. But she didn't want Azaroth to know that.

If he knew that, he might feel that he wasn't taking complete advantage of her and increasing his demands.

However, Erica also knew that if she hesitated too much, this guy might take advantage of this information and harm the Black Lake Sect. It wouldn't be a good idea to make him furious.

Thus, she acted extremely hesitant and unwilling before slowly agreeing to Azaroth's demands.