Maybe implantable slow-release THC sources could be designed for such people: it would be more convenient for them than frequent smoking or eating laced foods, and the control over the distribution would be easier to maintain.
I agree totally. If slow release THC will work, and she can tolerate it that way - then go for it. However, if the best response she gets is through smoking it, then merciful God in Heaven, let her smoke it, anytime she wants, and as much as it takes to give her relief!