K.W.
My children do not have Down's however both of my AFP tests came back positive that they both could have it. I followed up with the amnio's to prepare myself in case they did (you know, get a knowledge jumpstart on how life would be). If she is basing her fears off of that test, know it has a HIGH percentage of false positives. I would recomend reading up a little on children with Down's and wait to hear about confirmation. If she's not talking about it, it is because it is a very private and personal issue. One that a lot of people struggle with, options, are there options, what will I do, etc.
Let her come to you, it's h*** o* the family to let her have her space, but that is what she needs right now. She'll talk about it when she's ready.
-K.