For other uses of the name Beatrice, see: Beatrice.
Beatrice Snicket (also known as Beatrice Baudelaire, Beatrice Baudelaire II and possibly Beatrice Denouement) is the daughter of Kit Snicket. She is ten years old by the time her final letter in The Beatrice Letters is written.
During The End, Beatrice was born on the island. Her mother died soon after giving birth, as a result of poisoning by the Medusoid Mycelium. Named Beatrice after the Baudelaires' late mother, she was raised by the Baudelaires for a year on that island before they set sail to attempt to reach land.
Later on, in The Beatrice Letters, she begins to send letters to her uncle, Lemony Snicket, asking for his aid in finding the Baudelaires, who were separated from her at sea at some point in the last ten or so years.Violet allegedly made an emergency repair to The Beatrice in order for Beatrice to sail safely to the city. There, she entered the V.F.D. school and became a baticeer (a person who trains bats) just like Beatrice Baudelaire. Beatrice later acquires an office on the 14th floor of the Rhetorical Building, directly above Lemony Snicket's office. She eventually tracks him down, and her final letter is a note passed to him at a restaurant revealing that she is the ten-year-old girl sitting not far away from him. Despite this, it is not known whether or not all her written communication with Lemony was successful, as there is no record of Lemony replying to her letters. It can be assumed, however, that he received her first letter, due to the note in the margin that seems to be in his handwriting.
Although not a Baudelaire by blood, she refers to herself as 'Beatrice Baudelaire' in her letters documented in The Beatrice Letters. The most likely reason seems to be simply that she considers the Baudelaires to be more of a family to her than the Snickets (or the Denouements).
Her silhouette can be seen hiding in the back of Beatrice's hair on the cover of The Beatrice Letters.