She heard a familiar voice. No..it can't be. He died. She knows better than anyone he was dead.
Then she remembers what B told her, this wasn't her Xander, so technically, her Xander was still dead. Damn these parallel dimensions confuse her.
She looked to him in shock for a minute. She tilts her head but then started to tear up. However she was smiling because...HE WAS HERE! Alive! So those tears were tears of joy. She got up and in an uncharacteristic move, Faith hugged Xaqnder, though was careful not to crush him, making him crack a rib or something. "You have no clue to how happy I'm so am in seeing you, Xander!"