Very well said dear
You are correct as a woman.
But Twinkle's character is not the one that develops on her own.
She is immature who realises things late.
Had it not been Kunj's entry she would have never realized that her mother would never accept Yuvi or Yuvi is not correct for her.
Even if she stands up for herself she needs a strong support for eg. she can't alone face Yuvi and need Kunj's help.
So I feel (it's my personal opinion) that this wedding should happen so that she can get that support from Kunj to become independent to stand up for herself and to understand her own life.
If she was left upon herself she won't ever realize because she lives in a pampered environment.
So she needs to discover the harsh realities of life to stand up for herself. And by entering the Sarna family she would see a new face of life