Based on my knowledge of the case. It is very possible that Pat Ramsey was involved in her daughter's death. If she didn't do it herself. She covered up for the person that did. Unfortunately, now that she's passed without confessing, we may never know the truth about what happened to that poor little girl.
Many experts believe that JonBenet Ramsey's mother was involved in her murder. She may have been covering up the murder, or simply had more knowledge then she let on about the crime. However, after 20 years and the death of the mother, it is unlikely that we will ever find out the truth about the murder.
I don't think that any of the family members were involved in the tragic death of JonBenet but there may still be details of the case there are left to uncover. The murderer may have been watching her or perhaps knew the family and household in order to plan the attack.
Something strange happened in that house that may have involved the family, but with no clear evidence we shouldn't be tossing around people's names and judging guilt or innocence. Unfortunately they let the cops and press trample all over the crime scene so we never know the true answer of whether mom was involved.