If I understand correctly, the test just gives you the statistical risk that you have

She should be given statistics like 'one woman in five who has this result will have a child with Down's syndrome'. To know for sure, I think she has to have amniocentesis. In our case with DD, we were given the result of 'more than one in 50' but decided not to do amniocentesis.

Wishing the best to you and to your friend.