The only reason she would agree would be her mom's health and happiness. But what will she do when the contract ends?
It will be fine in Abhi's social strata to marry, divorce and remarry. But for Pragya it would be a big burden.
And how will she trust Abhi?
It would be very brave of Pragya to go ahead with such a marriage..
P.S. I don't see the possibility of any other kind of wedding happening between these two.