This video, I believe, is from after Bani's call to Lopa, and before Lopa's call. Lopa reacted with patience during Bani's call, and said the same on the weekend. She was clearly far more affected with everything that
followed her own call - i.e. being violently attacked, Bani's and other HMs' wrongful accusations that she spoke ill of Bani's mum, and being painted the sole bad guy in this - when Bani started it and equally muddied it.
And then she was almost unanimously declared the villain, and heard Salman tell them how both of them shamed their families and parents - all of this is what bothered her far more, and she didn't deviate from that on the weekend. It was Salman who enumerated all of what Bani said to Lopa - not Lopa, who much later stated that she has her own dreams of her career and shaadi, and only stressed on what Bani said about Lopa's credit cards after Salman spoke of her father, and upbringing in general at length. She was doubtless miserable about the whole thing - her own conduct included.
Lopa displayed patience in the task - which was the requirement - and when tables were turned, Bani didn't, and reacted violently towards Lopa, and with the HMs (barring Rohan) made Lopa the sole bad guy - this upset Lopa far more than anything else - and that is exactly what she showed too. It was Bani who attempted to lie on the weekend - about what Lopa said re her mum, about what she herself said to Lopa, and about her colourful abuses, both general and to Lopa.
As for Lopa saying 'I was sitting in the corner crying' when Manveer said we didn't know Bani spoke of your Nani - Manveer is in the video you posted, where (if you watch the full video) Lopa clearly tells them that Bani asked what was the saddest moment in her life, and she replied with her Nani's passing. Manveer already knew before the weekend - and Lopa was upset having recalled her Nani's passing.
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