If it is a female, dump her now. As time goes by, her being late will piss you off more and more. They do it on purpose, it's a passive aggressive control thing for women and it will drive you crazy.
ive come to learn that patience is a virtue because lord knows when you have a women or kids involed they can never be ready to leave on time so i just say we are leave an extra half ealier then we need to so then inturn everyone is read by the time i wanted to leave haha