Hello, I would be happy to help you with your question.
I am so sorry about your daughter's situation. What you are describing is called
hydrocephalus. There is an association with chromosomal problems, so the
amniocentesis is a good idea. There is no way to fully counsel your daughter going forward until the chromosomes are known - whether they are normal or not. The best thing you can do is to write down your questions for the doctor before that visit. The internet can provide some scary information on this topic, but there is no way to no whether any of it applies to your daughter. I wish you the best.
I hope that this helps and good luck!