I feel like tossing my spare change in here as well. I don't know what her reasons are for not being there or talking to you when she is supposed to. I know nothing short of a family emergency (something with my kids) or work keeping me or something would be an acceptable excuse. If I'm late, I'd pull over and call Him to let Him know I was running late and that I was ok. (I'm not allowed to use my phone while driving *grumbles*)

It's a respect issue even in a vanilla relationship, you let your partner know you are ok! If I didn't call my Master would be home worried sick about my safety. If I walked in the door perfectly fine with an excuse that was less than tragic, I'd be in a load of trouble. Honestly, I'd be pissed as hell if He did that to me. We respect one another far too much to do that. Though, things happen.

Not knowing what her reasons are, and judging by your ellipses in your typing while you said they were good excuses... I'm going to go on a bit of a tangent.

I'm submissive. Many subs (not all, calm down) like to push boundaries. We are often manipulative, and sneaky. For YEARS I test Dom after Dom to see if He was the one that could actually control me. Most of them were epic failures on that end. Not because they were bad Doms, it was just that we didn't click. I'm loud, blunt and opinionated. I often intimidate people in person. So it took someone that in a small way intimidated -me- to actually reign me in.

My off the wall point is, make sure it's not a manipulation thing on her part. It's usually not something that is done consciously. If it is, you will want to put your foot down on that behavior. I'd suggest letting her know the behavior is unacceptable, and setting consequences for when it happens. But be very clear about what is ok and what isn't if she were to miss a meeting with you, or not check in at the correct time.

And -that- is my two cents!