Well, some good news. Somebody already came up with a way it could have happened that doesn't involve the vaccine.
It's psychosomatic Dystonia!!
Isn't medicine wonderful? A brand new disorder!
The more interesting issue, is that she came down with the flu after the vaccine. While you can't get the flu from a dead virus vaccine, it is possible to get the flu after getting the vaccine.
It might be that getting the vaccine and the flu together could cause damage. The vaccine isn't 100% effective (we know this), so what might happen if you get the vaccine, and while your body is trying to mount an immune response (it can take two weeks after the vaccine) you get the flu, and come down with it (maybe a different version as well), that the double immune response could trigger a problem.
Investigation would be prudent.