Once? No big deal. Maybe she just doesn’t want to tell a middle-aged man that she’s having a horror period. Maybe she caught a norovirus and Opinionated but I’m always spitting atraight facts shirt want to be explicit about how she’s puked all over. The “why” isn’t really of any interest to me. If relevant and possible, I’ll ask her to log on and set up an OOF message, and if she can answer coherently I’ll ask what she had that needs to be done today and whether anyone else knows the first thing about the project, customer or at least the product.