I think it was the correct verdict. I am sure Frankie knew that Star could be harmed by SB, although I don't think she knew how to prevent it, so for me, that's guilt but there are mitigating circumstances. I have a great deal of empathy for Frankie and must admit there were tears in my eyes when she was found guilty and she got so emotional.
SB, as far as I'm concerned, throw away the key and let her rot. She knew exactly what she was doing.
One thing that has bothered me greatly throughout the whole trial is the perception of Frankie's family and in particular YS. I don't think she is anywhere near as bad as she has been portrayed. Yes, she may well have been out every weekend drinking, but she had just come out of an abusive relationship herself, she needed an outlet and she had no idea about the level of abuse toward Star. I don't think Frankie's upbringing would have been all that chaotic, no more so than many families around her. I think a lot of the narrative around the family has come from SBs family stirring the pot, trying to make them look bad.