Missing Prajna

My semi-Siamese cat Prajna is missing. She snuck out the door Thursday evening. I didn't go after her because it was late, I was ready for bed, and she usually just gets on a porch chair and goes to sleep when she sneaks out. But now she's been gone two full days, and I'm worried that either all the activity around the house frightened her or a dog got her. I hope she's okay, wherever she is.