Should there be further consequences for Dr. Laura's on air rant?

Here is a link to an air rant in which Dr. Laura utilizes the “n” word several times while accusing a caller of being too sensitive to racial slurs directed at her by friends of her husband. Was Dr. Laura justified in using the word? Was she justified in telling this woman she is just too sensitive and needs a better sense of humor? Dr. Laura has issued a public apology, is this enough?