How do I get help for a family Member not will to get help on drug addiction?

The only way you have a fighting chance of getting through to someone with addiction so they WANT help is to make things unpleasant for them. This is why formal interventions stress the consequences of what will happen if the addict does not go into treatment. Addicts have to hit rock-bottom before they change.

Loved ones can create the rock-bottom (to prevent it from becoming death or prison) which will force the addict's hand. But ultimately the decision has to be a personal one that the addict makes. Loved ones exert a lot of influence but you must keep in mind addiction is powerful, so it takes drastic measures to break the cycle.

Not only have your loved one caused you pain from their choice of using drugs but they have caused pain to their children also and sometimes this is the main reason why people choose to deal with others on drugs. This is why this step is one that their choice will lead to you and other family members needing to get counseling and help for themselves. Sorry but you may feel less fortunate to have been one to have to deal with the problems of the choice of addiction by a loved one but oh well, that's life and just like everything else in life, if you don't deal with your problems then you will never gain control of them. In recovery and at the early stages of recovery, one must learn the twelve step program. This is a program you should acknowledge for yourself. There are help groups such as Nar-Anon (a twelve-step program for friends and family members of drug addicts) and Al-Anon and Alateen (international organizations jointly known as Al-Anon Family Groups with a membership of over half a million men, women and teens, providing a twelve-step program of recovery for friends and family members of alcoholics.
How to Deal With a Loved One Addicted to Drugs - http://www.ehow.com/how_5812003_deal-loved-one-addicted-drugs.html

Since you posted on the legal board, rather than the relationship or medical board, I assume you want to know what you can legally do. Of course, you can involve law enforcement and state that you beleiev this person is danger to themselves and others. If law enforcement agrees they can commit the person for observation for 72 hours. During that time, you can have an evaulation done, which you can then use to bring an action to have this person court ordered to rehab.
This is a complex legal action, which requires and great deal of legal protocol since you are depriving someone of the freedom without their consent.
If this person has a hisroy of self destructive behavior, such as overdosing, frequenting dangerous places in order to buy drugs, exposing minors to drug use, or any behavior that would indicate that they are self destructive, that is the type of evidence the court will require.
Commitment against the will of a patient is difficult to do , especially if they have not been caught in criminal acts.
If their drug use has not gone that far yet, you magiht try an intervention. retain a professional in the field of drug/ alcohol rehabilitation to facilitate this. You must have the funds for rehab though, and it is very expensive. Places as famous as Hazelton cost tens of thousands of dollars.

Without details, it is difficult to advise you. If the child you mentioned is hers (or even if the child isn't) , if child protective services find out that drug use is going on with minor children in the home, there is a distinct chance they will remove the child due to the criminal behavior.

You can consult a local attorney that limits their practice to family law and get an opinion on the liklihood of the local court committing her against her will. While it is true that people must want to "get better"; if they are in danger of taking their life , accidently or on purpose, the safety of commitment is certainly better than the alternative.

You cant till someone hits bottem