While I have an opposed view and do think that HG/SS moves should be banned until NA gets the game*, I do agree that this should have been stated in the rules. As such, I have no real problem with her using the moves in the battle, since there was no specific rule banning them.
* After all, NYPC moves are banned because not everyone can get them; also, this is the same with a new generation coming out and the Pokémon being unavailable for purchase/capture/starting out until they hit NA.