My son also has cerebral palsy. The first thing we started with was the brain regeneration field. I only turned it on for the whole night and it already gave good results.
This is the set of fields my son listened to until spring:
I also recommend that you familiarize yourself with this topic, as it contains many recommendations for making playlists for the brain:
Also the fields that are recommended @SC448 I will add some explanations to these fields:
Microkinesitherapist field. On the Russian-language forum dedicated to children with cerebral palsy, there is a separate branch dedicated to the use of this therapy. The results described there are impressive. And the Sapien field is even stronger, since it includes all the knowledge about this therapy
The plasma brain. It is usually recommended to use it from a certain age. If your friend’s sister is younger, I would recommend that her parents study the branches dedicated to this field and other plasma fields to decide whether they need to include this field. For my son, I decided to turn it on. Explanations here: