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Open console then type help serana and find her NPC ID #
then type
setrelationshiprank herID# 3
space between the command and her ID# and space between ID# and rank
You need to have completed the Dawnguard as you said you've done but also need to have a good relationship with her.
Since she is not marriageable <vanilla> you can't have a relationship rank of 4 so 3 is the highest you can attain.
If that doesn't work , you will most likely need to revert to a save before asking her that question.