Three family members have said that Mollie was on her computer doing homework after her run. It's not official, but it sounds authentic.
Assuming that she did arrive home after her run, and did do homework, wouldn't she have let the dogs out of the basement? She wouldn't have put them back in the basement until the following morning when she left for work.
The problem is that other things she should have done, like sort out the car, were not done, so it seems like she stopped communicating after her homework, and before she wrapped things up for the next day.
Did she typically send evening snapchat?