It seems as though there is just enough magic for one trip. Regina as it suggests has some magic but not very much. She may be saving it for a last ditch effort to fight whatever she is going to face. Hopefully she realizes by now who Emma actually is. Gold did say that she thinks Emma is who she thinks she is. Gold’s suggesting the Savior but who knows what Regina is thining and besides it does not seem as though she can figure out things very well. Regina afterall was set up by Gold after the whole Kathryn and MM going to jail thing and did not realize the set up until the very end.