2. Poor Decision
If you notice a friend that you used to admire for always making the best choice, start making constant bad decisions, you may want to talk to her. Feel her out, there is a good chance she is involved with taking some sort of prescription medication or illegal drugs. Don’t be surprised if she becomes very defensive about your speculation. Unfortunately, this may not be a problem you can help her with. If your friend is a teenager, I would definitely tell a trusted adult to get her help.