Assumming this discussion is regarding Arundo donax, should your friend try to work with it she will find that the roots are incredibly tough and fibrous and difficult to process. Plus the concentration of DMT is not high, so the amount of work required for a decent yield is just not worth it IMO, potential toxicity issues aside.
People in the northern CA entheogenic community (me included) were trying to work up this stuff over 20 years ago. There are multiple reasons we abandoned it.
I know, not a tek, but those are my thoughts on the matter.