The Post-it Predicament (a Sherlockxreader fan fiction)

****I apologize but this is a gender specific xreader. I really wanted to try and not do so, but repeating names is not only redundant, but also not how people speak irl. ****

When a random girl shows up at 221b, Sherlock soon deduces she doesn't remember anything that isn't on her personal ID. The only other thing she has on her person is a post-it note that reads: "Sherlock Holmes
221b Bakers Street
:)"

What will Sherlock think when he finds out she's a lot smarter than what he thought prior? And with Moriarty on the run, she might be what he needs to solve the case.