They should do the CAPD testing in the soundproof room. For my son, they did things to look for a temporal processing disorder. So in the soundproof room, he wore headphones and they would present words or a series of clicks separate in time, and he had to respond to them. That was a small part of the test.
Shockingly to me, he did very poorly. He is both hearing impaired and has CAPD.
Hearing well is so vital for children. So far, this year has started off great for my son- maybe because his hearing aid is turned up louder and the extraneous noise (via the FM system) is quieter. He seems to be hearing better.
You would likely need to do private testing to see if your daughter has CAPD, to get those accommodations. Once we did that, we have easily gotten the IEP, and it's been a great experience/helpful for us.