I actually like her character.. She is pretty well playing as her age.
Vinnie was just excited about the night party just as kids get excited for everything. She did not provoke Adi to come to the party at all. Her sentence after listening of party was - " wow!! Kitna mazaa aayega, tum aa rahe ho na Adi ? " and Adi said yes. It was a sentence which expressed her excitement not provoked Adi.
Secondly, she informed Adi that her parents did not give her permission, later on It was Adi's idea of doing a fake call. She just kept quiet and allowed him to do that as she wanted to go to the party.
Thirdly, it was her parents who found out the truth on their own, it wasn't her who blabbered it in front of her parents, and when they asked her, she simply told the truth, just how even we do as when our parents gets angry.
Fourthly, we do not know whether Vinnie has told a lie at her house or has just informed her mother about her partner and whereabouts due to her father's fear just how Adi informed only Raman in fear of Ishita. So accusing her of telling a lie and coming to Bhallas is wrong.
Fifthly, the girl would feel uncomfortable as she is aware of Ishita's dislike towards her on top of that she gets to know that she has installed a camera to keep a check on them, would definitely make any person feel insulted. I wouldn't stay even in my best friend's house, if there is a CCTV installed in her room. I would also walk out just like Vinnie and say those words to my friend.
So I find Vinnie a very good girl.