Deirdre made hasty decisions all the time - mostly involving men. Rarely involving work. Her hesitation was mostly that she couldn't entirely believe that Irene really wanted to make the offer to her in the first place. Deirdre knew what she was. It was like being asked out by the hottest boy in school - it didn't happen to the normal girl, only the popular ones. But Deirdre knew what her answer was to the offer. There was no point in asking if the Vampire was sure she really wanted to make the offer. Deirdre had already given her an opportunity to realize her mistake and change her mind.