My wife has a B1/B2 visa that will expire next month. I am a US citizen and filed for her immigrant visa, already submitted all documents and payed all the fees, which have been accepted and approved by the USCIS and NVC 1 month ago, we're just waiting for NVC to send the documents to the consulate for the final step in the application.

Should I renew her B1/B2, can I extend her visa with a I 539, or should we wait for her IR1 (Spouse visa) process to finish.

Hopefully somebody can help me out. The issue is that we live in the border and need to cross weekly for our baby medical appointments, shots, etc.

Thank you.