I have a friend who has every excuse in the book as to why she is canceling or going to be extremely late. She cancels more times then she shows up. I no longer want to make plans with her or even go out with her. What"s the best way to tell her that her behavior is wrong and I am done?

You stop communication and move on.

Thanks that's what I was leaning towards

So don't.

You got a good sense of the picture.

How many times do you want to try?
Until it becomes a pain. A waste of time.

"every excuse in the book"
I don't like excuses. You?

Kind of like lies.

Ask her what's her problem? Find better more reliable friends to enjoy.

If you want to make an issue out of it just ask what her problem is, otherwise don't pursue it. Nothing ever came of your association with her, she isn't interested enough, so just move on.