The High Sparrow allows Margaery see her brother Loras who looks like a bag of rags soaking up water on the floor of his cell. He says he’s not strong, but Margaery convinces him that he is the future of their family and he needs to do what is right. Which will probably get him killed, let's be honest.
Her speech makes me think that the High Sparrow is setting everyone up for a trap. Why would the High Sparrow tell Tommen that Margaery was going to confess her sins and do a walk of atonement where people shake their schlongs at her while a big lady in a bad headdress yells, “Shame!” at her and rings a bell? (Girl, I got on an app on my phone that does that.) She’s staying strong; she doesn’t want to confess.
Because the High Sparrow knew Tommen would tell Cersei, who would tell the Tyrells, who would bring their army. Since he knows what is going on, he is going to best that army and have even more control of the country for himself. Or he wants to burn all of the establishments of culture to the ground and start something anew -- Dany style.