Just reacting spontaneously here, sorry if I missed information.
For now, going through the whole thread.
What is so chilling about saying I'll be right back?...brother, grandma...who was it? What a BS in this reporting all together and an "off" headline, but we are getting used to that, sadly.
Her grandmother must have known her demeanor....why go to your grandmothers home for a bag (what was in the bag?weed)? and money in the mids of the night? What is the explanation for that? An excuse because she felt so sad? Or did she have a key to her grandmothers house and she slept, noticing money and a bag missing? Her calling a sister: I can imagine calling my brother (who lives in another part of the country) in the mids of the night if I would be an emotional wreck (meaning very drunk and overly emotional, sobbing) and needed to talk to someone close. If I was feeling in danger I would call somebody close to home/hometown/the place I'm at, who could physically do something and drive up.
Video at the convenience store: About the clerk in the store. He makes a strange gesture with his hands, what does it mean? BTW...never knew you use a cigar for smoking weed, learned something new.

Never saw somebody doing it over here (the Netherlands) She looks agitated or drunk. Her family says she was buying a snack but it turns out to be a cigar...