During WW2, team of monsters led by Annabell Van Helsing must stop a group of Occult Nazis from resurrecting Dracula.

What purpose would Dracula serve the Nazis? Also what is the tone of your screenplay?

"must stop a group of occult Nazis" -- or else what?

The stakes: What's the big deal about resurrecting Dracula when there are already so many villains rampaging through Europe?

(has a "league of extraordinary gentlemen" feel to it)

Names and age are usually irrelevant in loglines. I'm in two minds about mentioning the name as not many people will be privy to the relationship between the name "Van Helsing and Dracula".
But in saying that, it is relevant to the story.

What is the protagonist flaw? (a personal obstacle to over come? The weight of Van Helsing name?
Is she a monster herself?