filing status for k3 visa
I'm married to a B1/B2 Visa holder who came for training in the US and we got married and she went back on time before her return date. Filed for K3 Visa but I filed my taxes as single due to her not having her Tin or social security number. Her Visa Interview is May 7, I need to send her the 1040 or 1040x amended return asap. Please help. Should I file a amended return as Married filing separately or married filing jointly. Since TIN takes weeks to get, what can I put as her social security number or any other options