Having said that Gunjan should without malice or anger, just ask Rachana (in front of her parents), why did you ask me to go meet Vihaan in the coffee shop in your place?
It will be obvious that the newly minted strong Rachana will fumble away.
Gunjan should then follow it up with another question: why during the engagement when Vihaan told the world about the coffee shop incident, did Rachana not say a word?
After this they should continue showing Gunjan in a good light, starting with her leaving the Garg family, move back go Mumbai, live in a hostel, and study, & become a stronger more independent young lady. She needs to leave the current toxic environment ASAP.
Rachana on the other hand should be shown as married (gosh at such a young age) with a kid, having had to stop her college & hockey, missing Gunjan & their fun ladakpan days.