She had given a list to her boss every year for 26 years, and the new boss for two out of those 26.
So, why all of a sudden, when the boss is out, the boss lowers the boom on her?
If there is evidence the list was approved by her boss she will have a case in her favor and/or the Union that represents her to get her job back. However if she took those days off without that approval then she abandoned her job and the organization has the right to show her the door.
Again without all the details the case is moot