BEFORE: While wintering on the continent for his work in finance, Thatcher Crickerly meets an Italian debutante and is immediately in love (with her and her dowry.) They begin courting, marry in Florence, and move back to Britain a few years later.
1875-1880: After difficulties getting and staying pregnant, Donetta gives birth to Venusia. A quiet and undemanding child, Crick is a happy toddler who takes after her father in temperament. At three, she demonstrates magic by causing a trinket in his study to spin. When she's five years old, her brother Merrill is born, finally providing Darwin with an heir.
1881-1885: Over years of spending Christmas and New Year's at the Crickerly country house together, Venusia and her cousin Max develop a bit of a rivalry. Venusia develops a bit of a complex about being smarter than the people around her.
1886-1887: It's time! Venusia goes to Hogwarts and is sorted into Slytherin. While some would think her a Ravenclaw (like her father,) the drive for her intelligence isn't intelligence's sake - it's outsmarting other people. She's an apt student, and becomes friends with a few boys in her year, like Elijah Urquart.  She also develops friendships with girl students, but more because she sees other upper class students doing so than because of a real interest.
1887-1888: In her second year, Venusia starts providing homework help to those who ask for it - as long as she can trade them for something. She's interested in being the best, and mostly trades in information.
1888-1889: Crick takes on Ancient Runes and Arithmancy as her electives.
1890: Crick is not made a prefect, which is not entirely surprising to her. In the first term of her fifth year, she very quietly starts to think that she might like to be an auror.