It seems I lost Serana, I told her to wait in the dinning area at Fort Dawnguard. Does anybody know where she goes when you leave her?

She's supposed to go back to Fort Dawnguard, but apparently there's a bug which can result in the "Follow Me" dialogue disappearing, and her disappearing once the cell is unloaded. As far as I know, the only way to get her back is to load an earlier save.

Well, if i tell her we should part ways. She sometimes response with, i Will be at darkfall cave or at that cove you visit in the mq. Maybe that happend.

Greets,

Maybe she went to annoy someone else lol.

Yea as Balancer said she can turn up in the mq locations