I usually don't see guys that keep calling because it make me feel rushed. Once I feel rushed I feel paranoid and put you in the potential LE category. It's best to call if you do not get an answer send a single text anything else is kinda overboard. However, I can understand your frustration but providers over no garuntees as this is a no strings attached business. Did you even arrive at her place? Just curious...

you made way too many calls.  Yes, when this happens it is very frustrating, but shit happens, and it happens on both sides of the fence.  As far as why she did that to you, we can only guess.  She may have done some screening research on you and decided not to see you.

Many providers will simply ignore communications from guys they no longer want to see, I know, it's happened to me.  

Time to move on.

Swim

You called 4 times the day of ... 30 minutes before and left a message then again about every 30 minutes??? That is a bit much but then again only 2 of them were before or at the appt time which is ok. Since she didn't respond the first time it makes sense to call again. It is possible something came up and she was unable to contact you right away.  Now maybe she is a bit freaked out by all the calls and messages.  

My advice ... confirm confirm confirm ... I like to call, text, or email the day of (hours before) to confirm. It has saved me so much time.

I had an appt with a regular today and about 2 hours before our meeting (an hour before I called to give my address) I dropped my work cell in the hot tub =( Not only was he unable to get ahold of me I could not contact him because I didn't have his info any place else. I bought another cell but still waiting for the service to finish switching to my new cell. I'm sure he will understand as I'm prompt and professional. But in the mean time he is scratching his head.  

So now I need to figure out a good system for saving client info safely.