I absolutely love the beginning of this story! I like how you started out with the mystery of Kat not remembering what happened, because that's a great way to get readers hooked on your story. With it starting off with so much mystery, you'll leave them wanting to read more so they can get more answers!
The only thing I don't like is the POV changes in the middle of the chapter. There's nothing wrong with it, per say, but it's just something that I've never been a fan of. I just like to either see third person or the same narrator throughout the story, because that makes for less confusion when reading.