Depression Support Group
Depression is a real and debilitating condition that is often misunderstood by family and friends. Its meaning can range from a prolonged period of sadness to an actual mental illness with specific symptoms. Find and share experiences with others who are going through the same struggles.
Your parents should quickly find a way to protect everything they have from her. I would offer her food, but no access to anything. Whatever drove her to steal from your parents won't just go away.
People who were addicted to pain killers were on a talk show today,
letting people know how easily your life can be ruined, just from taking a prescription for pain, if you become addicted. One was a fireman, injured on the job. They made it clear that it can happen to anyone. They were so ashamed of the deception, theft, betrayal.
If your sister does have a problem with addiction, hopefully you and your family can find help for her.