How to deal with & help a Prescription Drug Addict?

One of my good friends & neighbor has a prescription drug problem. She has always made up stories throughout her life to get Dr.'s to prescribe her hard drugs & get attention from those around her. One time she even pretended she had cancer. I've been friends with her now for about a year and witnessed an episode of hers in March of 09, she overdosed on her drugs to commit "suicide" for attention. She is married and has a baby that just turned one. I am worried about my friend but extremely worried about her baby with the way she acts. After her "meltdown" in March everything cooled down and then slowly she started saying things again & went back on prescriptions. Her story now is that she has carpal tunnel (which is new) It started out as just a little pain & has slowly gotten to the point where she is on 8 different prescriptions that we are aware of and hiding even more, shes even gone as far as to talking the dr.s into giving her steroid shots in her wrist & is even talking about surgery. her stories do not math up, when she goes to a Dr. that says shes fine she goes Dr. shopping until she finds 1 that will give her a "fix". She has even brought up something from the past that she has faked which is epileptic seizures. We know for a fact that this is a lie, I am also really good friends with her younger sister (Sarah) who says that whenever she seizes in front of her in the middle she starts laughing while she has the seizure. Right now she is on "Isometh-D-Chlorulphenz-AP APITP" "Amitriptyline 10 mg" "Celebrex 200 mg Capsule sea" "Tramadol HCL 50 mg" "Promethazine 25 mg" "Clonazepam 1 mg" "Gabapentin 100 mg" all of that is prescribed by one Dr. A different has also prescribed her "Topiramate 25 mg". Then in addition to those we also know that she has but is hiding Loratabs, Darvesets, Topamax, and a drug that starts with Gamb?. Her sister Sarah, husband Jerry, and me are looking at getting an intervention set up. Any help about how to go about an intervention, specialist we can contact, or your knowledge on these prescription drugs would be appreciated.