Hi and welcome to the Chiari forum.
May I ask, what all was done during her surgery....there are different types....one is more invasive where the dura is opened and a patch is placed, and some bone is removed from C1 and C2.....
Also, do you know if she has any related conditions?
Prior to surgery I had issues where my voice would disappear when I would try to sing....it was really odd....not sure how to explain it but I was told it was Chiari related.