They've all drunk so much that they'll pass out before anything happens. I'm guessing MT will reveal the truth to her rather than the guys.
The rice scene was well acted by all, and so ominous. You felt Ananyas disgust when she looks at Amar and equally horrified by the force of MT to find the ring. Garv had her hand and that's when she panicked to pull free but was again submerged by MT; the visual metaphors are worrying, and you can see the suffocation written on Ananyas face during this bizarre ritual. It was kind of repulsive to see Amar sliding his hand over hers whilst looking at her straight as if to defy her to speak out. And as far as she knows he is her brother in law.