Also, have you tried administering cannabis in different ways besides smoking to get results? Vaporizing and eating, as well as sublingual tinctures all can have varying effects on the system and may treat some of her conditions more appropriatley than just burning one up. This is especially useful if you find that the other cannabinoids aside from THC seem to be more affective for certain conditions/symptoms. You can always make a sublingual tincture with a higher CBD/CBN content when certain strains aren't always available, or if you are not able to grow your own. Also, look into vaporizers. Accuratley controling the temperature at which the herb is heated can control the ratio of CBD,CBN to THC.

There's information out there regarding the utilization of all the properties of cannabis, but for most it just takes some self experimentation. You can learn new things about controling your body you never thought possible.