"Saudi citizens do not need a visa to stay in the country up to 30 days, but what would be the procedures if the student wants to stay for 6-8 weeks as in this case? Does she have to apply for a visa from her home country or can she extend her visa locally in Seoul?"
Frida Test,
미국에서 온 학생
They can only stay up to 30 days as you know and there is no available longer term visa for Saudi students.