She is impulsive and egoistic. Seema's words have hurt her and still she has made her effort to be nice to Seema, but Seema has always utilized the opportunity to humiliate her. What Seema did in the party was very bad - she used to be intolerant, but insulting a family member in public is shame for the family itself.
Pia is brought up with love and Bani has taken all the stone hits in the life, making the life easy going for her sisters. She wants money, no doubt. But, I think, Pushkar should also make it a point that he talks on behalf of his wife, just to keep her in control, till she is used to all the family members. But, he is also helpless, since he has lost the job, and loses his temper. It is just that, everything is acting in a catalytic way.
I guess, Pia will eventually take up her modeling job and will be opposed by the family, and she will not care for their words, finally ending up as an actress to make lots of money for a lavish life. In the bargain, Pushkar will move away from her. Jai will be satisfied.