Wronfully Terminated and no Union help, Iranian U.S. citizen

My wife is from Iran. She is 47 years old and a U.S. citizen. She was also a Union member. She was fired from her company after two years for using up her occurences alloted for the year. She had been sick throughout the year at different times. The last time I had to pick her up at work in a wheelchair. She was fired for violating company policy of exceeding her occurances. The Unemployment Commission sided with her two times agreeing she was wongfully terminated. I have 15 Pages of documentation to back up the claim. Her union filed a grievance, but made little effort to fight her case. She was told that due to "security" reasons she was not allowed on company property for the grievance meeting. Her union handbook states she is to be "present at all steps of the process". Because she could not be present the informaton never got to the company and she was told the process was over. How do you fle a grievance on a union?