Was Anna Nicole Smith high all the time on her shows?

I'm uming you know Anna Nicole Smith. She had her own show, The Anne Nicole Smith Show. Well, I just thought she was really fun and hyper and crazy on her shows but my mom told me she was high on her shows. I even looked it up and of course the Internet will tell you every thing but I heard she would smoke cocaine before her shows and pop narcotics so she was really high if she did all that. Did she? And why was she high all the time?