She
can just walk-up and buy tickets at the gate, assuming the park isn't at capacity (which I doubt will happen next week). She should know 2 things:
1) all tickets are digital so I believe she'll need to create an
MDE account anyway (and it's probably easier to do from home in advance rather than while standing at the ticket window)
2)
ticket prices "at the gate" tend to be ~$20 higher than purchasing online (even just that morning)