I forgot,
Did Madison say that Barbra and Ali had coffee at the shop? Or was this assumed from a common routine? In know people who are coffee addicts, so it is possible that Barbra may have had another cup at home. Too cold for Barbra to be in her sleepwear only based on the weather, if accurate above. Unless she had a coat and that was not mentioned? We don't know.
Conway is not eliminated, but I think that due to her health issues, she would have trouble doing this murder and draging Barbra's body. If Jeff didn't do this, and was not a part of this, why is he so evasive with Madison when they talk?
Satch