According to them, Anu is selfish because her action doesn't match their interest and on top of that provides Pakhi discomfort.
Selfish people usually can't tolerate a situation, where they are being at disadvantage at any level. That pretty much defines Baa, Pakhi, and Vanraj's behavior. (Not just now, like every time till now)
I think it would be useless to ask them, what if Pakhi was stuck there. They would have found another reason to blame Anu. Now the school is blaming Anu, if Pakhi was to be there, the first people to blame Anu would be Shah Family.
Now to answer what I would do, India is still a democracy. No matter how much corrupt the system is, it is possible to fight back. Especially when almost every evidence and witnesses are on your side. The school can't just throw out Pakhi like that.
Anu's job is another story tho. They do have authority there. But still, even if you go down, you shouldn't go down without a fight.
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