If both of you are ready for divorce then go for mutual consent, if you are not willing to return to India then file divorce case against her in USA and settled there but the divorce granted by the USA court will not be valid in India as per section 13 of CPC.
13. When foreign judgment not conclusive.- A foreign judgment shall be conclusive as to any matter thereby directly adjudicated upon between the same parties or between parties under whom they or any of them claim litigating under the same title except,—
(a) where it has not been pronounced by a Court of competent jurisdiction;
(b) where it has not been given on the merits of the case;
(c) where it appears on the face of the proceedings to be founded on an incorrect view of international law or a refusal to recognize the law of India in cases in which such law is applicable;
(d) where the proceedings in which the judgment was obtained are opposed to natural justice;
(e) where it has been obtained by fraud;
(f) where it sustains a claim founded on a breach of any law in force in India.
It will be better that if there is any threat from your inlaws side then file a complaint against them before police or court and if after your case, they file any case or complaint against you then their complaint or case can be consider as counterblast case.
It will be better to contact over the phone with all the details of your case or situation to get beat advise.
Feel free to call