I don't think the two combined would be such a great idea.
Marijuana is her choice, it is addictive But on the other hand, Crystal Methis a lot more dangerous and is for losers who want to end up looking like a skeleton:
http://www.youtube.com/watch?v=GS8XY4GMnJk
^ The effects.
Tell her to watch this video, see if she wants come crystal meth then!!!
Marijuana for what, dont you think it is addictive. I dont if it is approved legally to use it. Mixing the two I do not have an idea about it. Even I dont have the proof. So she should consult the doc before trying anything on herself as it would have a impact on her health.