I don't view time quite the same as many people do, but I'll share mys perspective if you'd like. :) I feel that we are all always where we need to be when we need to be there. Those that choose to share time with you obviously value you and dictating when and how they share that time isn't exclusive to either party. I don't promote vindictive behavior, but if you feel it's disrespectful or bothersome to you, then you need to discuss it with her and if your perspectives don't align then maybe it's time she is the one left showing up after you stopped waiting around a few times until they come back into alignment. Just my thoughts.
RE: How do you deal with someone that's always late?