Hey bro
You need to have some THC to deal with migraines I know I've had chronic migraines a long time. I would recommend that Haze CBD by Dinafem its one-to-one ratio would probably be mild enough for your mother. Then there's a nutritional supplement called apigenin which also would help reduce the psychoactive effects and lengthen the medical effects of the cannabis. You just need to take it 30 minutes prior to taking the cannabis oil.
When you get ready to make some oil or whatever you're going to do look me up I've been doing this for a little while. I've kind of made all the mistakes and figure it out the better Methods, at least in my opinion.
Here's a some picture some of the stuff that I do. It's very important to with novices to THC that you have a structured and measured way of giving them their doses. That way if they get to the point where they don't like the side effects they come back down one dose.
In the pictures below the strongest capsules are the ones that I make from the 2.5 X the weakest are the 20 X. The 2.5 x contain 360 mg of cannabinoids. That's two times the THC to CBD. A dose of about that much to 500mg knocks out my neuropathy pain real nice.
Where I'm currently growing
Where I'll be Nov 1st