It's not a 3 inning game, it's a 9 inning game that has been halted until more favorable weather.
The stats count (but are not official until the end of the game) so it's just a game that is in its 6th inning of play.
I realize this, but essentially it is a new, 3 inning game.
The score is tied. It's going to take place 2 days later, so the bullpens are all now equally refreshed. All the momentum that either team gained in the previous 5-1/2 innings are now erased. New scenarios are now possible that weren't before.