She forgot #3: Just use one of the whitelisted shorteners she mentioned further up in the article, e.g. goo.gl.
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Not quite as simple as that, none of the three are readily available to use by just, say, visiting the site and typing in an URL. You need toolbars/extensions/clients etc. If she usually uses a client that's set to xrl.in changing to another shortening service might be a massive pain.
http://goo.gl/
"Google URL Shortener is currently available for Google products and not for broader consumer use."
It is interesting to note that common users can easily use goo.gl by using google toolbar's share function.