Jack Monroe is just as bad as her and has wrote pretty awful tweets too.
Katie should have just sucked it up and apologised though. I'm sure she's not bothered though, this has just made her more marketable for the Daily Mail and won't really cost Katie a penny (she has legal costs to pay too, up to £300,000). Daily Mail / her management will probably cover it.
The amount of coverage and tweets and commentary she has got from this is massive, people flock to her articles to be "shocked" and to post comments etc.
She's great for what she's there for and that's upsetting those people who like to be upset by anything they think they should be.
She writes well sometimes, this piece she wrote yesterday on her dying Grandad is excellent. http://www.dailymail.co.uk/news/article-4293430/KATIE-HOPKINS-Dea etc ...
She'll continue to make money and continue to upset people. Don't buy into it.