I'm the original poster and wanted to add:
I've also read that if we proceed with having her get the mortgage in her name, we would be forced to refinance after marriage when my name is added to the mortgage and my lower credit score would cause an increase in the mortgage rate at the time of refinancing.
Does anyone know the best way to proceed? We truly want to get the full tax credit as well as receive the lowest possible rate. Twenty-five percent of our current combined after tax income would be between $1600-1700 so we're looking to spend a little under that range as a monthly mortgage payment. I believe that her information alone would be enough to qualify for a mortgage size of what we would be looking for.