You could also try to find out if she'll be having another set of classes in the new year and if she is then just mention that you would like to attend a 30 minute session to make up for the lost time that she owes you. As was mentioned this is a busy time and she could be overwhelmed by that or maybe even health issues that she prefers to keep private... I'd give her another chance to reply before going public with it. If you get nothing then you'll know she wasn't the person you thought she was.