Yes, during her sentencing hearing, Ellison expressed deep regret, saying that she thinks about the harm she caused every day and wished she had been brave enough to speak out sooner.

Yes, Ellison cooperated extensively with prosecutors, meeting with them around 20 times and testifying against Sam Bankman-Fried during his trial.

Ellison was sentenced for her role in a massive financial fraud, which involved the misappropriation of $8 billion in customer funds from FTX, the cryptocurrency exchange founded by Sam Bankman-Fried.  

Sam Bankman-Fried was convicted of multiple fraud charges related to the collapse of FTX and is serving a 25-year prison sentence. He is currently appealing the conviction and sentence.