Most likely seen on the disney channel, redhead teenage girl with fourtune teller old friend that helps her with a potion and spell to make her become popular like her idol, an 80s synth pop girl singer

And I also remember something about her putting scarves on lamp shades before her crush comes over?

Please help!

It was called Teen Witch..
Teen Witch (1989) (http://imdb.com/title/tt0098453/)

If you search on YouTube you can actually watch the movie.