Since Tempest Came back to Canterlot, she Spends her years serving Twilight and Helping others across Equestria. 5 years would pass as Tempest gets her horn back, but unsurprisingly gets a pair of new wings.

Twilight made Tempest as a Alicorn because She wanted somepony close to her and be happy with for the next Generations, and these two would also get married and will become a family in another 5 years or so.



Just note: that this is non-canon or unconfirmed-canon, as this is just my Ideas on what Happened to Tempest after the MLP's Final conclusions.