We have tried different browsers, different laptops and different course pages but the issue occurs in all instances. Other users with the same role are not experiencing this issue, so it would appear to be linked to her specific profile. She has not experienced this problem previously with quizzes and has not been added to any other course recently in any other role. No error message appears on the page either.
I have also tried unenrolling and re-enrolling her in the course, but this has also not helped.
Does anyone have any idea what could be causing this?