The picture of AM with the Scream mask on caught my eye. Could she be part of a group that wears those to disguise themselves? (For whatever reason)
Also, isn't her dog an English Bulldog? How did her dog keep up with her running, especially in warm weather?
I ask this because maybe that's why she left him behind. Too hot!
I don't believe the Scream mask has anything to do with Ashley missing. Yes, Ashley would not have the Bulldog (Flicker) run with her on hot days. She would wait until the evening to run with Flicker.