Hello,
To clarify, she is Russian living in Russia. We met in the US and travelled together in Latin America before she returned to Russia. The interview will be in Warsaw (according to what I have read), but I am not certain what will happen between NOA2 and the Embassy interview in Warsaw other than filling out paperwork and waiting for the appointment. So it may make sense for her to not return to Russia?
I will retain my home in the US and will be back to it after she returns to Russia. Once she has the K1 she will move with me to my home in US. That is the plan. She will also retain her apartment in Russia while we do this.