The diagnosis is solid. The cause is likely genetic, likely from her maternal grandfather's maternal line. Interesting. Katie looks very much like that great-grandmother and her family. It appears that some other things came along with what we see from the outside.
Treatment? Too early to tell. Prognosis? To early to tell. Neurological condition? Doctors are doing everything they can to give Katie's body a chance to heal in a way that minimizes neurological effects. But it will be considerable time before anyone knows her condition exactly.
Katie is being treated in a Children's Hospital in a major metropolitan area with lots of experience in treating children with Cardiomyopathy. Without a quick response and a skilled team of specialists at the hospital .... Give thanks for those medical folk, their skill and their caring.
Please continue to pray for Katie, Christie and Meghan ... and for Miriam, the exchange student from Germany who is currently part of their family.