Tanveer wants to take revenge from the people who humiliated her - Razia and Imraan, but she is taking a twisted way. As she said that she wants to show Razia her aukat using Asad's status and money. She is using Asad. Why is she doing all this when Asad and Khans have been nothing but nice to her? Simple,she has no sense of right and wrong. She just wants her position secured. Just like Razia who never cared that she was ruining Rashid and his family 17 years ago.
Why Asad and not some other rich dude? Asad is handy and her time is ticking. Bachpan ka dost, family knows her well, likes her, Asad blindly trusts her - it will be quite easy to dupe them and trying to trap some new guy.
But, I don't think she will achieve much. She will just play reverse cupid in Asad-Zoya's love story.