As someone conducting pageant workshops on Q&A, I never encourage memorization. But I don’t restrict it completely as well depending on the capacity of a trainee to think more spontaneously. In Eva’s case, she could have simply quoted it. After all, Nadine Lustre is a popular name and figure in the Entertainment Industry. If Wynonah Buot can specify host/actress Toni Gonzaga as a source of admiration, then I won’t find fault in the former using Nadine as inspiration for her answer.
But that controversy will die down in a matter of days, and Eva will continue with her reign. I reckon that Miss Grand International owner Nawat Itsaragrisil has already given his thumbs up to her selection (photo below) as the Philippine rep to his pageant.