Can any one suggest best scooter/scooty for ladies in india?

Looking at your requirement and considering your wife's weight, lets cut down a few options from your choices. Hero Honda Pleasure is light and is a 100cc vehicle so, its a good option for your wife. But, maintenance and performance of Pleasure is not rated high over the Activas and the Dio's. I've been told that the mileage is also under 40 on a Pleasure. Activa is a good vehicle which is tested and proven over the years in the Indian roads, Mileage and the weight is a definite points to look into since, Activa is heavier and its average mileage is around 40-45. Don't consider the Scooty Pep+ or the Streak as it is below 100cc and less power when compared to the other scooterettes in the segment. Moreover, the spares part costs are exuberant in TVS vehicles. Aviator is not doing that good in the market, so suggest you to take a test ride on Dio and if your wife is comfortable with it, go for it since it is definitely lighter than its cousin Activa so, more power than Activa and better mileage than Activa as well. Anyways, if you need a couple of choices, then decide among the Dio, Activa or the Pleasure. If I were you, then I'd have gifted the Dio.