Someone needs to ask her what project she is bringing to the retreat. Ask her if she is going to be able to manage it on her own because there will NOT be someone there to help.....everyone will be doing their own project. Maybe someone could suggest a project for her that she could manage, or help her pick out one. Be honest with her, and tell her you think this project might be beyond a quilt retreat. Tell her she will need more than one project....just because she may get stuck and there will not be anyone to help her. This girl might be over zealous and not realize it. She probably does not realize how much time she is taking up of other peoples time. Ask her to watch someone else tackle the same problem.
I did not read all the responses to this thread so I may have repeated this. Just my 2Cents.