Well, the novella is, essentially, an extended journal by Laura which was published after her death around age 27. Le Fanu's ending is curious. Laura remains mentally haunted by her encounter with Carmilla and even sometimes imagines she can still hear her prowling about. The reader is left to wonder if that is just Laura's imagination or if the sudden illness and death were from a resurrected Carmilla.
It's possible the series will follow suit and we'll find these Vlogs being watched by her dad or other character. The creators seem to want to subvert the standard format of the tale, making Carmilla a protagonist allied with Laura. They could end up with Laura a vampire, or Carmilla turned human. With the vampire ending, these could be a record of her turning, and the human one could be a record for their descendants?