
Quoting
T53147
OP,
If the woman came in June, how can you already have a relationship after a month that is appropriate for a marriage proposal? If you were acquainted before she entered on J-1, there can be a problem in that it looks like she entered on a non-immigrant visa with the intention of remaining.
Please be advised that there is a significant problem with marriage fraud with very short term or long distance relationships. As the sponsor, you are committed to supporting the individual you sponsor to 125% of the poverty level even if the marriage is of short duration. This could leave you unable to support yourself if you are borderline on the sponsorship financial requiement.
There is no reason to rush into a marriage since it is easy for a US citizen to sponsor both a spouse and fiance. Step back and think with your brain. If it is true love, it will survive - and deepen - with the separation the immigration process requires.
If you need further assistance, consult both an immigration and a family law attorney (for a prenup).