As I understand it :
1. Somer walked from school with her friend M ; they walked along Gano.
2. Somer ran ahead,and caught up with her siblings in the 1100 block of Gano.She became upset after a conversation with her sister,and ran ahead.Her siblings lost sight of her in a large group of kids walking along Gano.
3.She was seen at the propane tanks on Gano.
4. She was seen at the Gano House by a worker,who said she praised their work,and then left the way she came.
5.Connie S's daughter saw Somer at the junction of Gano and Grove Park Drive. * Somer's siblings did not see her at all on the rest of their walk home. We do not know who, if anyone,she was with when Connie S's daughter saw her.*
I have been thinking in too much of a linear way, because I placed her at the corner of Gano and Grove Park, AFTER she exited the Gano House. It could easily happened that she walked back to the Gano House AFTER she saw Connie S's daughter. Didn't an anonymous caller suggest that LE check the Gano House and dumpster ? They must have seen something ?
For what it's worth, I believe that most construction companies -- even small ones -- start work early, about 7a.m., and finish up early too, usually around 3p.m. * Speculating * that someone could have offered a ride, or gone to the park with Somer ?