so i have already beaten the dawnguard main quest line and sided with harkon, and i kept serana along because she is good company but she disappeared. she has before but she normally will just show up when i fast travel, wait etc. so i didn't panic when she first didn't show. but i've waited more than a few days and fast traveled multiple times and can't find her. last i had her, i was in the radiant something, fancy clothes store with the ugly, [censored]y elf sisters and i killed them both because i finished the little side quest with one of them and i didn't want to marry the other. and i don't need fancy clothes. and serana was with me when i did that, and that's the last time i remember having her. in my saves i have one right before i assasinated the sisters and the next one is in riften and i believe i made that save by the time i was looking for her already. i've already gained six levels and done stuff , so it would kinda svck if i had to go back to that last save. i've already checked Castle Volkaflsld;lre (the vampire place), darkfall cave, dimhollow crypt (the place where you find her), the fancy clothes store in solitude, riften, my house in whiterun, etc. and when i talk to another companion they say "looks like someones already following you". plus i heard serana can't die . HELP .

You might actually have to, and don't worry. The stuff you've done can be done again but better the 2nd time around
But ... other then that. Maybe try to get another follower and see what there response is. If she's still with you, they'll let you know that... IDK where I was going with that.
Try checking all of the castle or the Dawngaurd hold. She if she's lingering around there, or if possible, to whatever active quest you were on, she might be there waiting on you.
Hope some this non snece helps you out. cheers!!!

If you can't find her anywhere then you will have to Revert to your old save,,,,,Its the only way....




People Are To Obsessed With Serena