How is a weed pipe different from a tobacco pipe? Is it smaller or something? Or is has obvious MJ residue on it? (and if that's the case, wouldn't they have busted her for possession of a controlled substance?)
I'm totally ignorant about such things, just think "paraphernalia" laws are bogus.
She probably should be contacting a lawyer; not you, and especially not a bunch of dudes you don't even know on the Internet.
"The only way to stop a bad guy with a gun is with a good guy with a gun"