Christian was about to have enough of his sons-in-law in his later years. Their rivalry was becomming insuffering for the old king, and it annoyed him terribly that they all pushed to get him let Kirsten return to the capital. However, when he died, most of them united in their fear for Frederiks reign. They did'nt liked him or Sophie Amalie much, but they undoubtedly just tried to put their differences apart because they were afraid to lose their power and wealth. Corfitz suggested they should try to work something out that would skip Frederik in the line, and put his two-year old son Christian, on the throne instead, with Corfitz as his charge of course. The others refused. None of them wanted to give Corfitz more power, he had plenty of that already.
I don't know how close Leonora and her sisters were, but I don't think there exist any letters that could show some correspondence between them. If they were, their husbands rivalry must have been hard for them. But the times were different, and if someone stood in the way, you pushed him away, even if it were your own brother. I don't think we can find the same close relationship between Leonora and her sisters, the same way we can with Alix, Minny and their siblings.
After a while, Ellens anger towards her daughter cooled down, and she tried her best to get Christian to accept Kirsten's youngest daughter, Dorothea Elisabeth, as his. When she did'nt succeded, she started to support her daughter, and she knew that her granddauthers and their husbands were on Kirstens side too. She only supported Vibeke Kruse, because she knew this woman would'nt be a threat to her. When Kirsten fell from favour, Ellen was afraid to lose all the land, wealth and acknowledgement she has gained as the king's mother-in-law. Vibeke was a simple woman, who, in Ellens opinion, hardly could put two and two together. If Christian's eye had fell on an "Anne Boleyn"-like woman, Ellen no doubt would have done her best to make sure she did'nt got a foot inside the king's bedroom or heart.
By the way, Leonora and Corfitz inherited Ellens huge castle, Ellensborg, where they lived after being released from Hammershus. Today it's named Holckenhavn. There was a fire in september, that nearly made the old tower collapse. Luckily it did'nt.
After their failed attempt to escape, and they had been seperated, they finally got a letter through to Frederik III. Leonora complained of their horrible conditions in the prison. It was one thing to be in jail, but it could'nt hardly be right that they were to be starved, humiliated and the very ill Corfitz beaten by the commandant. Adolph Fuchs of course defended himself, and wrote that they exagerated. He knew how much the queen hated the couple, and thought if he treated them badly, it was a way to suck up to the queen so she might would speak in his favour when a better job became vacant. But Frederik still sent one of his men secretly to Bornholm to see if the things Leonora wrote, really was true or if Adolph was right. When he confirmed Leonora's words, Adolph was put out of office, and Frederik gave his half-sister and brother-in-law an offer they could'nt refuse. (Sorry about the godfather-quote, but it fitted so good and I could'nt help myself

) Corfitz felt a bit humiliated by having to bow down for the king, and give up his properties, fortune and only keep Ellensborg, but Frederik's offer was very generous considering Corfitz' actions in the past. Sophie Amalie was of course not thrilled with his decision to release the couple, but Frederik was'nt so inhuman in this case, as his wife.
When the dummy of Corfitz were to be executed, Sophie Amalie wanted that Leonora should be forced to look what would happen to her husband if they caught him, but Frederik forbid such an unneccesary cruelty against Leonora. Still, Sophie made sure that Leonora's keeper stood outside her cell, and told all the details of what happend to the dummy down in the streets.