i know this sounds harsh and maybe even impossible to think of.....but what about actually giving her to the police? Not only is crystal meth seriously dangerous ....but like wantsto said...its legally dangerous for you as well....sometimes we have to do drastic things into order for a drastic result...and to be quite honest with you im not so sure your daughter will admit she has a problem for awhile unless she hits rock bottom...and perhaps a rock bottom moment would be jail and no available meth....i know what im saying is horrifying...i mean ratting your daughter out ...almost sounds like abandonment...but its really not....you have to be firm in your convictions...and allowing her to stay in your home with no job and doing drugs (even though she lies you still know about it) is almost like letting her .....she may state she is a big girl who can take care of herself...well let her then deal with law as a big girl would do....as a consquence for her actions....as well as living on her own as a big girl would do.....perhaps it may not go as planned...but whats the worst that can happen if you take her to the police? Jail time?rehabiliation and therapy?? a place where her druggy "friends" cannot reach her...remember crystal meth is very dangerous...and if she is as addicted as it sounds she is....withdrawing is very serious...and im sure to some it can be deadly...so please, dont just wait and watch until she admits it...that might not be until she is so far in she doesnt know which is day or night....take action now....stand up for yourself and your home and your family....and she might hate you for alittle while...but in due time she will realize what you did was out of love and concern.......good luck in whatever you do decide...