Try mentioning the cause.
Autism is basically said to be missing brain connectins in the frontal part of the brain.
Tell her to think of a computer. If one opens up a computer and randomly scores through a single circuit on the computer internals without knowing what it does, and puts the computer back together again, and does the same to several other identical computers but cuts through a different circuit on each one, and then goes to try to run them, some computers would not even start. Others will run but severly impared in even doing anything! Still others will appear to fu ction and run normally until one day one goes to try to do a certain task....
This is the best analogy I can think of which will explain why some can be severely dissabled and others are not through having the same condition.
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