1) Of course she's going to "lie" about buying drugs. First because of the legal issues, and second because she thought it didn't have anything to do with her missing kid.
2) "Shown more concern for SA..." I'm not seeing that. She seems to be pretty involved in trying to find out what happened to Hailey. Maybe this is in your opinion.
3) Innocent people lie to the police all the time, for lots of reasons. Innocent people have even confessed to murder.
4) "She lied about X, therefore she must be involved in the murder of her kid" is pretty tortured logic. Seriously, how many threads are there on WS where someone involved in a missing persons' case "lied" to the police about something and ended up having nothing to do with the crime?
I agree with you on #1. The affidavit said she bought drugs, so apparently she told LE that, therefore, I don't give a rat's behind what she tells NG.
#2. It is DEFINITELY my opinion she has shown more concern about Shawn.
#3. Innocent people also tell the truth to LE all the time. In this forum, for every case you find like this one, where the parent(s) and/or SO's of parent(s) have been scrutinized to the degree BD and SA have, you will find at least 5 cases where the same group of people appear to have been barely looked at. IMO, there is a reason for that.
#4. I am still at the stage where I don't think BD was involved, but it's getting more difficult to justify it. I agree someone lying about one thing doesn't make them a murderer, however, if someone lies enough, and lies about stuff they shouldn't be lying about, IMO, that looks suspicious.
I care about what has happened to this child, so I want to know why things are playing out as they have. I want to know why Billie would lie to LE about Shawn threatening anyone, and downplay it, when Shawn was the last to see Hailey, according to Shawn, and if I want to know that, I can't understand why Hailey's mother would not want to know why Shawn lied about where he was during crucial times when Hailey went missing enough to even ask him.