H-4 visa re-stamping procedure

I am H1B visa holder & my wife has H4 visa status.We have already renewed our respective visa (I-797 Notice of Action)). It is valid until Sept 2017 . My wife alone would like to visit India in near future.

Please assist me for following matters.

b Can we complete application & appointment (Mumbai consulate) procedure from US ? If yes, then[/b]

b What is the procedure to get visa re-stamping on her passport? [/b]

b What are necessary documents required to fulfill this procedure? [/b]

b How much individual fees apply for this procedure? [/b]

I will be be highly grateful to you for valuable help & assistance.

Mitesh Shah