Name change after marriage doesn’t need any document. In India they do not even ask for marriage certificate. One can easily give the new surname. I am not 100% sure if it works same way in US, although there’s every chance that it should.
However, if she’s getting her passport renewed too (along with addition of your name), she can change it first and then you can use the latest information. That will make it simpler.
Drop in a note to VFS and check before submitting, to be absolutely sure about it.