No reports of her acting strangely earlier in the day. She had been on her way to the airport but something happened on that 6:10 cab ride to change her mind/plans. Without cab or car, she somehow arrived back in the downtown area, and her demeanour was strange enough that folks called 911 around 7:00. That's an approximate 45 min window in which something went very wrong in Emma's life.
Where did she get out of the cab? Was it within a 45 min walk from downtown (thus clutching shoes because her feet hurt)? Or, was she driven back downtown, and was clutching her shoes to her chest as someone might do when they feel in need of protection (like when we hear something awful and bring our hands over our chest).
I'm still highly suspicious of that cab ride, and with Emma being a private person, i'm not convinced she'd even tell police what it was.
MOO