I 100% agree with those that say you should ask for your money back. Don't let this go. Besides, it's more about your time and emotions (looking forward to the session and then let down by being ghosted). This behavior is not the norm among established Dommes, I assure you. And it doesn't matter what the reason is. She should refund your deposit and offer an apology - and a spiff. Free fan site access - something. That is what a professional would do in a circumstance like this.