I'd say 'keep talking'! I know you are in a hurry to get to the full swap, but don't hurry her. She'll probably come around - in the long run - but don't pressure her. And keep talking - you say you don't have any secrets and you talk all the time - just keep that up.
We started out soft swap too - and at that time I didn't think we'd ever do a full swap - but the fantasies took over and after discussing it FOREVER, we went for it. We both knew that if either of us were uncomfortable we'd stop and walk way - but we both truly enjoyed the full swap! We knew before we started that we would! We'd discussed it (like I said) FOREVER.
So... keep discussing. Keep talking. Keep fantasizing.
Sarah