Just adding my opinion about the Mom's 911 call:
I do not find the mom's 911 call to be hinky. I think I might be in a minority with this opinion, but I can't help thinking that how she sounds and what she says makes a lot of sense. Here's why. . .
*She mentions not being sure about when she could report her daughter missing. I totally buy this. I also thought you had to wait 24-48 hours to report an adult missing. I feel like I've heard something like that on crime shows or in the movies. The point is, I think this part of the 911 call is plausible/believable.
* She does not sound particularly panicked in the 911 call, but this doesn't set off my hinky meter either. My reasons are twofold: 1) she sounds like she is trying to sound "professional" on the phone--this is something I do when I call places--you want to be taken seriously, so you try to sound calm and collected. It did not sound fake to me, nor did it sound like she didn't care. She took the time to give all the details she had, and she did actually seem worried when she spoke about MC not having her wallet.
I don't know what happened to MC, and I think without some more clues from LE, we won't know either.
I think this case could take a lot of different paths. I can see someone MC knows being involved, and I can see a stranger being involved. I can see it being accidental, and I can see it being intentional. I guess we just have to wait it out and see what LE reveals...