It must be said that she had a talent for potion studies, and was quickly noticed by an official sorcerer who took her on as a student, her luck being far better than Alexander's.
However... the early stages of potion studies required a vast amount of resources, and Nancy constantly rejected contracts with attached conditions offered by other warlock families, causing her to live a rather poor life.
In the end, she barely advanced to an advanced apprentice, but during a journey, she encountered an accident and was assassinated by an intermediate apprentice from a hostile warlock organization...
Indeed, even as an advanced apprentice, she hadn't purchased many Level 0 witchcraft spells, nor did she have much real combat experience, so being killed by an enemy one tier lower was not something unimaginable.
However, such incidents rarely occurred after one became an official sorcerer.
After all, the difference of a single major level at that time was almost insurmountable.