Simplify the following text for a Grade 7 native English-speaking person.
Original: She became a student of the French ballet-master Louis Gallodier in 1786 , at the age of nine , and when she graduated , she was considered as one of the first great products of the newly founded Royal Swedish ballet .
Simplified: At age nine ( 1786 ) , Hedda became a student of French balletmaster Louis Gallodier .