If you are captain, she can't be assigned a single chore properly.
In the tasks whatever she does is right, but if anyone else does the same its wrong.
On top of that she has huge support of the show's host who taunts, insults and even threatens if you are against Mandana and openly tells that she is my favorite and I encourage her.
In my views as a housemate
1. Don't talk to Mandana as much as possible.
2. If need be talk to her as sweetly as it can be and keep it short.
3. Never ever dare to argue and just tell her that she is right the moment she pounces on you.
4. Don't talk about her at all in the house to other housemates.
Only that would stop her from playing victim card and woman card. Will keep her out of footage.