Several thoughts/questions: 1. If her mom thought she was coming over for supper, did she try calling her to find out if she'd changed her mind? 2. If someone had arranged to pick her up and take her to work, did he/she try calling Mollie or family looking for her when she didn't come out to car? 3. It concerns me that if she had a ride to work, no one has been mentioned as someone who was concerned because she never came out to get into car in the morning. I feel so sad for the family not knowing where Mollie is.
I'm perplexed by the fact that her mother doesn't seem to have followed up on it, when she didn't show up for dinner. The only thing I can think of would be that Mollie was very casual with family commitments, and they were used to having her say she'd show up, and then not show up--either from being tired, getting distracted by something else, or having a better offer show up.
This is a very long shot, but I've wondered if a 'friend' showed up and offered her something more interesting: "let's go out and have some fun." So, she shoves some money in her pocket, doesn't take her ID because she won't be driving--(or, her OTHER ID. When I was in college, quite a few years ago, a lot of people had fake IDs), doesn't take her glasses because she won't be driving--do we know exactly how severe her vision issues are? Are they really bad enough that a prospective night out on the town without glasses would be unthinkable? So, this scenario would be a variation on 'abducted by acquaintance.'
By the way, I've been trying to figure out why her prospective ride to work doesn't figure in the timeline. Perhaps it was on a: "if you need a ride, call me" basis. So, her brother assumed she's gotten a ride to work with the other person; the other person assumed she'd gotten the use of her brother's car, and she just fell between the cracks, with neither one realizing that anything unusual had happened.
