I would suggest taking a look at this thread for some general advice on adverbs and adjectives. There are some useful links there.
Otherwise, some problems I notice:
1) Your opening could not be any less reminiscent of Bulwer-Lytton’s “It was a dark and stormy night” beginning, which you should read about here. A good thing, though, is that you don’t linger on the weather but get straight to the character.
2) You shift tenses (past to present).
3) You often employ stock phrases or clichés. They color your writing, but not in a good way. Random examples: fiercely dark December night, flooded her mind, stalking the streets, by her lonesome, To make matters worse, dressed to kill, too much to bear, for dear life, a matter of life or death. In some cases, entire sentences are composed of these phrases. E.g., “To make matters worse, she is dressed to kill.” We’ve all heard this kind of stuff before. It’s so common that it’s become meaningless.
4) You try to use interesting words (usually adjectives or adverbs), which would be halfway okay if they made sense. I encourage you to continue to use the thesaurus, but only when you can’t find a fitting word by yourself. And if you must use one, please make sure you learn exactly what the word means so you can apply it well. Otherwise you will end up with phrases like intently stupid, sear with uneasiness, flippantly alert brain, and so on. Some of these almost make sense.
5) In a similar vein to #4, it seems you’re afraid of using the same word twice. You use the phrase dainty hand in once sentence (cf. #3 here), and then refer to that hand as an “extremity” in the next. Variety of language is necessary, and it’s good that you know that. But some words just don’t fit into where you’ve put them.
6) Similar to #4 and #5. You may want to use more discretion when choosing adjectives. It’s not enough that they sound good. Your character is drunk and has just fallen, rather clumsily, and cut her hand open. But you call her body “nimble”.
7) Skipping ahead to the ending. I like the way you build tension. For the most part it is successful, but then you undermine all that work with an ending that is incredibly cheesy and out of place. “It is too late. Much too late my friend, she is yours now!” Muahahahaha! I can almost hear the evil laughter. I can almost see the unambiguously evil presence rubbing its unambiguously evil (“dainty”?) hands together.
And then I feel trolled.