Here is the case law and Foreign Affairs Manual
Matter of Cavazos, 17 I&N Dec.215 (BIA 1980)
That case held that the presumption of immigrant intent does not apply to immediate relatives if adjust ment is filed within 60 days.
However, that does not mean that the USCIS cannot look at other facts and they have many resources available to investigate whether there was a fraud or misrepresentation to the CBP when questioned at entry. So for example, if the CPB officer asked your wife why she was coming and ifs he was going back home and she answered "yes" but had abandoned all her ties to her home country then the USCIS could consider her statements as being a misrepresentation or fraudulent. So the adjustment could be denied on that basis and not on the immigrant intent issue.
Here are the relevant notes from 9 FAM §40.63 of the Foreign Affairs Manual ("FAM"):
Your plan will not work.
She cannot enter the US as an intending immigrant without the green card.
Or she needs to marry here, apply, get permission to travel and then you do the marriage in Armenia in the church.
But if you leave to Armenia before she files for the green card and gets the permission to travel in 90-100 days she cannot come back until she gets her immigrant visa there in Armenia and that will take 6-9 months depending on if you file for the K3 or CR1.
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