Edited to say: That would indeed be a crucial question. Now I see that what I think was initially described as a sighting on Via Marisol was in fact an image in Lomitas Drive going southbound towards via Marisol.The most recent image on the tracker map shows Alison heading south on Lomitas Drive towards Via Marisol, but from there it's not yet clear if she turned east or west.
Turning left (east) at the junction of Lomitas and Via Marisol would have taken her south on Via Marisol, as you noted. Turning right would have taken her west towards Monterey Road, Debs Park, the Arroyo Seco bike path, the overpass towards Northeast Los Angeles, or any number of other places.
Which way she turned at the Lomitas/Via Marisol intersection is crucial.
From the photo, it looks to me as if she's about to turn left and go southbound on Via Marisol.
JMO