The US court granted Exparte divorce, which of course is not valid for the marriage solemnised in India as per Indian laws.
In this it is to be noted that whether appeal was filed against such decree within the period of limitation even though it is stated that family court had passed an exparte order to set aside the divorce.
It is reported that an exparte decree was passed in the RCR case in favor of the husband.
Further it is also noted that the minor child is in the care and custody of the biological mother at USA.
Therefore it is clear that the child is safe under the custody and care with one of its parents.
It is not known if the child is an Indian citizen or US citizen.
Whatever, since the child is residing in overseas with the mother, the child custody case filed in India may be lacking geographical jurisdiction and the powers of Indian court cannot be beyond the country's limits. Besides the Indian court lacks jurisdiction to try the child custody case, since the child is not residing in India
If it is still considered as an act of bigamy for the other spouse to marry an American at USA post USA exparte divorce for the marriage solemnised in India, you can file a private criminal complaint before the jurisdictional judicial magistrate court, however since no cause of action taken place in India, it may not be entertained in India.
The husband is reported to have obtained RCR decree in his favor through an Indian court, whereas it appears he did not file an execution petition to execute the court order instead he is showing interest only to file various criminal cases against her.
Therefore no criminal complaint is maintainable against her including the husband's desire to take steps to impound her passport.