Her Panamanian passport? Her permission to be in the country comes from her U.S. visa, not her foreign passport, although it makes sense for her to renew her passport such that she has current evidence of her identity. She can check with the USCIS about any requirement to have her visa updated such that it is reflected in her renewed passport.Quoting sphynx77
You would take the normal steps - get a marriage license, get married before somebody authorized to officiate over a marriage, register the license....Quoting sphynx77
Once married, if she wanted a green card, it would make sense to apply to adjust her status. You would file an I-130 petition for Alien Relative, and I-485 application for permanent residence. Your fiance should obey all U.S. laws, including immigration laws, during the time the applications are pending.Quoting sphynx77

