@Peter ********

All an agent can do is take the documents that you provide and submit them by mail exactly as you would have done. They cannot change or speed up the process.

There is no way to "streamline" the process, and there is no expediting option overseas. Just go to the embassy website and follow the instructions exactly, and you should have your new passport delivered to your door in about 3-6 weeks. The process will not be any faster in Vietnam, because the bulk of the time is the wait for the new passport to be printed in the US and sent back to the embassy.

@Steve ******

Adding additional pages has not been possible since 2015.

This doesn't really seem like a change. And I find it hard to believe that the goal is to find overstays, since the documents will be checked by the usual teenage contractors, not immigration (and you can still use ID other than a passport).

@Kevin *********

That's just very strange - I wasn't aware that the US would be checking the reentry qualifications of someone DEPARTING the US. Did they show you the message that they said came from US authorities?

@James *********

The OP has explained that she's still in the US and was trying to board the first leg of a round-trip journey to Thailand (I had also assumed she was in Bangkok and trying to return to the US).

@Glen *******

That is not the case for the US.

@Kevin *********

How long has she been out of the US on this trip? Did the check-in staff misunderstand or misread her travel dates?

The green card itself should be all that is needed to enter the US as long as the holder has been abroad less than one year. If she has been out more than a year, she should have applied for a reentry permit before departing the United States. You can Google "US reentry permit" for more info.

@Derek **********

Sorry, I didn't express myself clearly - I was just noting that the situation you described was an out-and-out scam, while the one mentioned in the OP was just a case of accepting a bad exchange rate.