Just keep working without her.  Three may be a small number compared to finding a convenient meeting time for twenty people, but the project has a deadline.  The project is also critical.  If she is a good person, she will either find a way to make the scheduled meeting time, or she will admit her failings and give the other two "workers" all the praise when the project is a success.
 
Just be sure to document who was and was not at a scheduled meeting so you have documentation if you have to "tattle" when the boss returns.
 
Good luck.  Not a fun situation to be in.
--
Jason Schubert
Curator
J.M. Davis Arms & Historical Museum
Claremore, Oklahoma
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