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I am just curious if there is any rule stating that she must be here in the U.S. more than she is out of the country.
The rule is that her one true
residence must be in the United States. The "welcome to the United States" letter that she received with the Green Card should have had the info, but it's also on
Now That You Are a Permanent Resident page on the USCIS website.
Maintaining Permanent Residence You may lose your permanent residence status if you commit an act that makes you removable from the United States under the law in section 237 of the Immigration and Nationality Act. If you commit such an act, you may be brought before the immigration courts to determine your right to remain a Permanent Resident.
You may be found to have abandoned your permanent resident status if you:
* Move to another country intending to live there permanently.
* Remain outside of the US for more than one year without obtaining a reentry permit or returning resident visa. However in determining whether your status has been abandoned any length of absence from the US may be considered, even if it is less than one year.
* Remain outside of the US for more than two years after issuance of a reentry permit without obtaining a returning resident visa. However in determining whether your status has been abandoned any length of absence from the US may be considered, even if it is less than one year.
* Fail to file income tax returns while living outside of the US for any period.
* Declare yourself a “nonimmigrant” on your tax returns.
So as soon as she moves to another country intending to live there permanently, she's given up the Green Card.
This has nothing to do with removal of conditions; the abandonment of status issue would be true whether or not the card was conditional.
The good news is that, by the time she does want to come to the US to live here permanently, it sounds like the marriage will be over two years old, so she'll be eligible for a green card with no conditions at that time. The bad news is that you've got to start all over with a new I-130, virtually equivalent to someone who had never filed immigration paperwork.
US Immigration law doesn't have a good solution for the spouse of a US Citizen who wants to come to the US occasionally but not live here permanently. She probably doesn't qualify for a visitor's visa, because her marriage constitutes ties to the US that imply immigrant intent. But she can't keep a Green Card for long unless she resides in the US. A legal solution is to apply for a new marriage-based visa each time she wants to visit, but that's costly, inconvenient, and time consuming.