1. The emails, subject to their content, can be sued as evidence in a court of law.
2. Considering her academic qualifications and prosperous employment you are not liable to pay a single penny to her.
3. Gone are the days when divorce cases ran for 15-20 years. In Delhi a divorce case takes 1-1.5 years on an average to be decided by the court. In other states the time is certainly more, but the difference is not huge.
4. You have the right to unilaterally file for divorce on the ground of cruelty in addition to annulment if she refuses mutual divorce, albeit nullity is always very difficult to prove as she will refuse to go for a medical test.
5. If she does not appear to contest the case the court would grant you divorce. Courts do not wait till perpetuity for the opposite side to appear.
6. She can certainly file dowry charges against you and your family members as anti dowry laws in India are used as a potent weapon by wives to harass husbands. If and when she proceeds to file the case you should immediately seek anticipatory bail.
7. The case can be filed only in India. UAE courts cannot grant you divorce in the circumstances narrated by you.