1. The threats what she posed in her legal notice are just imaginary concept that she has uttered in the legal notice.
Her threats are not maintainable.
If she had sent a legal notice you can engage the services of a lawyer in India and issue a suitable reply denying her allegations.
She has already participated in the mutual consent divorce obtained from a court in Dubai, hence the allegations leveled now by her is not tenable in law, hence you need not be worried about such gimmicks.
2. The procedure to declare the divorce as valid in India have been informed to you in the previous posts plenty of times, however it is repeated that if you want to get your Dubai court divorce declared as valid through an Indian court, you and your wife have to be present before court and file a declaratory suit before the court competent praying to declare the divorce as legally valid.
The suit without your physical presence and her presence may not be entertained by court.
3. There is no question of ratification. It is declaration. The time taken for disposal of a civil suit in a court of law cannot be predicted owing to various factors involved in it.
4.You do not have to budge to the pressure tactics adopted by your ex or her lawyer.
You issue a notice to that lawyer to refrain from threatening you and can ask him to proceed as per his whims which will be challenged properly in the court of law as per provisions of law.