So she will be ok if she is denied boarding? These days it is hard to believe that there is no one she knows that has a laptop, tablet, computer or smartphone and that there is no computer at her hotel or at where ever she is staying in LA.
That said, on our last enhanced voyage, there were a number of people who showed up who claimed to have no idea that a test was required. There were a certain number of tests available at the port but you have to hope you are early enough in the line before they run out.