It simply was too much to listen to Pansy's high-pitched shrills, to watch Draco stride about, practicing Snape's flowing robe trick, to have Blaise always watching, never doing. None of them, she felt, knew what it was to be Slytherin. To be cunning, to use any means to achieve your ends.
Muggle things included (they had such strange ideas about magic). Her perusals of London's library lead to the inspiration of many a spell, which she patented and sold.
Her eternus juvenis spell, however was a secret she'd never share (and the potrait hanging in her attic would never tell).