Ack! I hate this question... I can never answer it!
Maybe, you call her, but follow her lead? Give her the opportunity to say something, but don't bring it up yourself? Hopefully there will be other opinions, I don't feel nearly as strong on this one as I do on others!
So... I should call her....? it won't be easy as i go straight from work to the airport... do i send an ecard? email? text?