From what I understand by watching the court videos and various legal youtubers, BSS relies on the defendant claiming they intentionally / reactively killed their abuser because they were so mentally feeble or desperate as a result of enduring abuse. Now IANAL and it is for the defence to put their case, the judge to oversee the case, and the jury to make up their minds.
However, for 4.5 years it seems to be that SB has stated they had a beautiful day of art and crafts, nobody laid a finger on anyone and she simply fell asleep, she wasn't drunk, they played a game of hide and seek, she went to bed, waking up to find JT deceased, a shocking situation that made her distraught with grief so she said. That his death was unintentional.
Her own sustained version of events directly conflicts with the videos she created, that seemingly she's been refusing to look at and acknowledge. Now she's finally having her moment in court and the story has radically changed. We will have to wait and hear her testify but the videos still conflict with any credible story IMO and it certainly directly conflicts were her accounts to the present time. I'm not sure how she can recover this situation, if at all.