He could press all he want, but her father's location would not pass her lips. As none of Bruce Wayne's less public actions had passed hers. It was the burden of being an unwilling secret keeper between two enemies she had great affections for.
"I have no doubt of that," she nodded, ignoring his less than subtle jibe at her father's actions. She neither condoned, nor would she defend, those actions, but if Bruce was trying to make her feel guilty then he would be sorely disappointed. She smiled cheerfully, and leaned in close enough to whisper, "Perhaps you should not have include real candles in the decorations. Especially when you are drinking. We would not want any more accidents."
She lowered her mask for a moment in favour of subtly removing a small object from her purse. Returning the mask to her face, she set down the empty champagne glass an a passing waiter's tray. She held out her now-free hand, ready to pass on the small object to Bruce. "I am sure you have many more important guests to greet, Mister Wayne. I would not want to keep you from them."