CBDs for epilepsy???

I was approached today by family friend whose young 8yo niece is suffering from daily siezures. Conventional medicine I nt working.
Knowin I am a caregiver they came to me wondering if I can help in any way with Cbd's. now

Of course I want to help in any way possible. But they are wanting completely thc void product. No psychoactive properties whatsoever.

Is this possible for a small caregiver with limited budget to achieve.??

Or I guess what is the process people are using to make this pure Cbd oil?

I've also here's about harvesting plants in veg and using all te plant matter?? Tha could be completly false as I'm have no idea where I heard this.

I want to figure out if its doable for me to make this oil. So any idea/ advice thanks. All

Im thinking you can only achieve this in a lab. CBD oil is like $175. And it would last a patient many months