No she's not.
Shes quite simple and shes seeing things for how they are. She's Karans friend and just cos she agrees with him or stands up for him doesn't mean shes playing according to Karan - we've seen that she has told Karan where she has found him wrong too. And it is because of their genuine friendship that Karan has accepted his wrong and actually apologized.
Funny how Vivian, Avinash and Eisha aren't ever judged that they're playing according to Vivian or according to Avinash - how is their friendship considering genuine when Avinash is so quick to judge his other friends - and no doubt if they ever tell him he's wrong he will instantly have a rage attack 🙄 I've never seen any of his friends tell him he's wrong and him accepting it - he's always always got a counter attack 🙄 (i didnt mention Alice in this cos she's not gone, good riddance but also she just seemed like a showpiece once Vivian joined).