Dracula speculation, spoilers for 128-year-old book
#DraculaDaily thought: hold on, if Dracula has a psychic link with his victims and vice versa (as we see later in the book with Mina), how come he couldn't see through Lucy's eyes and find out there was a vampire hunter who was On To him? E.g. the garlic flowers, etc.
(Yes, Lucy does try to rip up her last letter, but I think that's more like her vampire instincts are taking over.)