How do know if it is "very very rare"? A study in Portugal suggests otherwise (7% of autitic kids have a mitachondrial disorder. http://journals.cambridge.org/action...ine&aid=282214
Besides, nobody actually knows what happened with this girl. So there are no "facts". As far as your supposed facts, the girls family seems to think otherwise:
The Polings were exploring two theories about what happened to Hannah. One is that she was born with the mitochondria disorder and the vaccines caused a stress to the body that worsened the condition. The other was that the ingredient thimerosal caused the mitochondrial dysfunction, Jon Poling said.

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