If you're seriously upset when your female model cancels on your photoshoot - then you don't understand women. Women love reacting to the world around them. You offered to do a photoshoot and her reaction was: "Yes, sure!". However, this reaction will soon be changed with a new reaction which might be: "I am tired". This is not something that you can control, so relax and think how you can hedge this situation in the future.
I would recommend booking at least two models for one photoshoot.