Minor Sherlock Holmes characters

Toby also featured in the novel Sherlock Holmes vs Dracula; or, The Adventures of the Sanguinary Count by Loren D. Estleman, when Watson and Holmes called on Toby to track Count Dracula after finding him in a meat-packing district -- Dracula's carriage having rolled through a distinctive piece of rubbish -- allowing the two to track Dracula to Watson's house in time to learn that he has abducted Mary Watson.

Question: was mary watson in the sherlock holmes books
Answer: yes