Interesting points to ponder:

-Riley was writing in her journal. She asked for the day's date. Perhaps a letter of apology for ditching, her feelings, ...a suicide note? (the last is not likely imo)
-Riley knew that the corn and grain were rotting. Did she check the farm on her own?
-Should we have caught the fact that Riley wasn't really going for a smoke? Last I recall she gave them up when Lizzie was booted from the building (Riley was out having a smoke at the time and swore them off afterwards).