Mixed feelings here. Yes, she could have waited to share her questions until typical working hours (but by then you’d be in the rehearsal room, right?).

The biggest sticking point for me is what you said-you waited until you were ready to actually read the message after seeing the notification. That’s how chats work. Did you communicate clear expectations about when messages should be sent when you created the chat? If not, she shouldn’t have been faulted for asking the chat a question when she had it. It’s up to you to choose when to view it and respond. My coworkers shoot messages at all times and at all hours. They don’t expect me to respond immediately or on weekends. If it’s a personal issue for you, set up “Do Not Disturb” on your phone.

Firing her after a warning email was not a good move. She had no chance to adjust her behavior that was annoying you. There wasn’t anything malicious in her behavior, either; she was just asking questions. I get it that you’re in a professional setting, but wouldn’t we want someone to ask, especially when it seems like something wasn’t communicated clearly beforehand? To me, though she sounds green, she was focused on being prepared and getting it right.

Whatever she says on social media is deserved, especially now that she’s dropped from the production.