Simplify the following text for a Grade 12 native English-speaking person.
Original: Helping to redefine genius ( a word which at the end of the 18th century was only beginning to take on its modern meaning of exceptional or brilliant ) , Wollstonecraft describes Mary as independent and capable of defining femininity and marriage for herself .
Simplified: Wollstonecraft describes Mary as independent and capable of defining femininity and marriage for herself .