Of course the epileptologist should be consulted but that doesn't mean you can't do some research on your own before the appointment.
My personal experience with CBD extracts in the form of sub-lingual sprays, drops, and capsules is that they didn't do much of anything one way or the other for me.
There is a product however, that I've been having really great success with called Holden's Hope. It is a cannabis paste made from a very low TCH/high CBD plant cooked at very gentle low temperatures and then mixed and ground into the cooking oil which is coconut to form the paste. The TCH content is low enough that it qualifies as legal in all 50 states.
This method, as opposed to the high heat and chemical solvents that are used in most extracts seems to me to work better at delivering the whole goodness of the plant undamaged.
I have also tried and liked the vaporizer systems with CBD oil but that might not be applicable in your case since you are talking about a child.
I wish your granddaughter healing.
