What I'm stuck on isn't if this was an odd request or should vinegar raise suspicion, because who knows for any given family. But fast forward a day - GS is missing, people are asking "anything odd stand out on Monday?" She delivered those items to her mom, who had sent her straight away from the home when she arrived home from work. LS had to have used those supplies basically right away when HH delivered them. Then shuffling LS around town, picking her up while she ditches her car at places. That's what's odd about not cooperating with an interview. Taken separately none of it is weird. Taken with the fact that your step brother just went missing and your mom is cleaning his room with vinegar solutions and being flighty all around town should be noteworthy details to pass onto investigators. And this wasn't some random missing person like her mom's druggie boyfriend or some tinder date. It was a kid she knew well, lived with, shared a family with. And even as recently as mid-Feb she's still relaying on dubious info with the pregnancy stuff - well after fleeing from CO and all the news and stories on the Internet, according to the AA still not cooperating to fill in details after thinking it over a couple weeks.
She should have talked to LE, IMO. I was hoping she was separated from TS and was cooperating in some way, but the AA clears that up.