If she won't reply it means she wanted a night of fun and now feels like a slut every time she thinks of you or that night. She'd rather not see you and be reminded of it. Better to just move on. If you really want a reply, you can bait her with a text that is nearly impossible to ignore. "Wild night last night, ran into some friends and they knew you so well, can't believe we know so many people in common." She'll be dying to know who it was and what was said. When she replies say, "hey can't talk right now, about to walk into a meeting, but if you're free for drinks at ___, love to catch up and chat about it." When you meet up, just be like "oh I'm sorry I thought it was you, but it turns out it was another girl."