The K-1 is a single entry visa, if used the last time, and then left the country with out filing for AOS and AP, how will you be able to provide them with a copy if the I-94 card from when the K-1 visa was used? You will run into a problem when the copy of marriage cert shows a date before the entry listed on the I-485 paperwork used to adjust status.
Looks like you will now be filing for a new visa K-3 or CR-1 in order to re-enter the country and get green-card.
QUOTE(desert_fox @ Sep 17 2007, 04:33 PM)

QUOTE(daileydiver @ Sep 17 2007, 03:18 PM)

My wife has travelled many times from Spain to the US. Spain is a member of the Visa Waiver Program and she had to travel back to Spain for a family emergency and now is ready to return. So my question: Will there be a problem with her returning using her passport as she always has or are they gonna flag her since she entered on the K-1 the last time so we could legally get married? I did not think this would be a problem because if the VWP, but now i have my doubts. Anyone know the answer?

If she entered as a K1 and left without Advance Parole, she cannot get back in the US on the VWP.
If you are still within the original 90 days, she can get the K-1 revaludated bu the Consulate to re-enter again, but the original 90 day clock is still running.
Wont work OP says "WIFE" in his post. K-1 is for FIANCE(E) only.