1. It can be, yes - these cases are very detail-specific, and the actual act (of intercourse) does not necessarily need to be proven. In all honesty if you're ever on the receiving end of an AoA suit, you best speak with an attorney.
2. The court can issue a subpoena, yes. You would then have to file to quash the subpoena for the same reason - GA doesn't have personal jurisdiction over you.
Seriously this would be the time to speak with a local attorney.
You could always, if it's simply a matter of distance, request to appear telephonically.

