I filed an i30. I got married in india. I am a natural born citizen of the United States. When I got married my wife did not change her middle name to

Immigration looks at the name you put in your form, the name on the beneficiary's passport, the name on your marriage certificate and even provide areas within the I-130 form to provide "other" names used by the beneficiary. It is going to be up to the immigration officer to decide if the middle name matters. If there are discrepancies in names, they may ask for more information.