It will take several months longer to get her back into the States because it is taking that much longer to process the K3 visa. I haven't checked lately but earlier it was an extra 3 or 4 months, I think....Different processing center and procedure.
I also think that you should give her time to see if this is what she really wants. Moving far away from her home is a big culture shock. With a fiance visa you and her have 90 days to marry.