Hopefully, it will help your friend a bit to know that at least everyone around her will have to be masked in all queues, attractions, and inside. That covers the places where Covid spread are most likely. And also, statistically speaking, at least 40-50% of the people she shares space with should be vaccinated. Hope she still has a good time.
Fully agree with everyone that Disney rushed this. Should’ve announced the decision but with an effective date further out