mj takes a month to get out and some times more it is in ur fatty tissue so the fatter u are the longer its in ur body it varies from person to person spmeone as skinny as me can get it out in 3 weeks buy not doing nothin but not smokin but in ur case is what u need to do is i guess try a detox drink i do not no how good they work because ive never used them ,,but really u have no choice u have to try somethin so like some up above do all of the above but most importanly do the detox drink and fallow the directions closley but i can tell u from expierence and like i said im very skinny just drinkin lots of watter and juice does not work it might work for a hour if u drink a lot and pee a hole bunch but u have to leave ur home and drive to take the drug test and rember it in your fatty tissues so peeing wont help her unless they are gonna drug test her at ur home and u no when they are comin and she can drown herself in drinks and keep peeing and still no garentee ,,non of these methods are garentees some things that work for some will not work for outhers it depends on height weight metoblosim thinghs like that but ur best bet is like i said some kind of detox drink method,,i wish u and her all the luck in the world and if she does get cought just tell the judge that ur gonna make her get help and rehab being that she is young he will go easy on her she wont go to jail unless she is already on probation ,,,good luck