So I am about halfway through the Forgotten Vale, and we run into a frost giant. I start blasting it with crossbow bolts from a nice distance, and Serana decides to fight the beast with a dagger. She runs up to it, gets pounded with the frost giant club, I mean she gets NAILED, she shoots up into the sky like a rocket. I kill the frost giant, and now I cant find Serana. I am inside the inner sanctum,and she hasnt shown up. Has this happened to anyone before? Did she crash land back in Skyrim?

Wait 24 hours or go outside and fast travel to the closest marker.

Ive lost her before

She got inducted into Skyrim's space program, you won't see her again XD

She is a Daughter of Coldharbor, She has to recover from transforming into a flock of Bats before She can find Her way back to Our character.

She is flying into space and slowly becoming a living asteroid, eventually she'll crash into another living asteroid vampire named Cars.