My girlfriend is in the United States on a J1 visa. While here she fell in love with me and now we Are considering declaring a domestic partnership in order to deal with a difficult landlord who wants to prevent us from having a roommate. I am a US citizen and she is from Italy. If she gets a domestic partnership with me, will this hurt her chances of getting a J1 visa in the future? She would only get such a visa in the event that she accepts a PhD program offer from an elite university (she already is seeking a PhD at a foreign university).

Would getting the domestic partnership hurt our chances of being approved for her lawful residency in the future if we were to get married?

Thank you.