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/c

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.