Behaviour issue. I change her behaviour.

Hello mam/sir,my fiancé of a year and gf of two year is pursuing her MBA in Gurgaon where as I'm in Varanasi,I'm writing this message for change of behaviour since she has started living in delhi,she has a major ego issue,not only I but also her parents are worried/skeptical of her behaviour post-marriage. Ill give you a example,she has uploaded a few indecent pictures(her cleavage is visible more than normal),her mom has asked her twice to take them off from social media platform,even ive tried telling her about indecency of the pictures once or twice in a subtle way but she didn't do anything about it,and a few days back my relative has informed me that how your fiancé has some unusual pictures uploaded on insta,and when I told her inspite of understanding she blamed it on me that how I've changed as a person (coz once id told her filth is not in the picture but in viewer's mind)also not it then she didn't have as indecent picture as she has now. How can I change her behaviour.