From the photograph, I think it is safe to say that no substantial part of the aircraft contacted the trees on either side.
There are three possible reasons;
the aircraft was at a high angle of bank as it passed between the trees
the aircraft bounced over the trees after initial impact
the aircraft somersaulted and pivoted around the trees in some way
A fourth option that should technically be considered for the sake of completeness is that the trees were not in the path of the aircraft. I think this can be safely ignored after fairly cursory examination of the evidence.
A high angle of bank would be the the simplest conclusion that fits the other observations at the scene. A turning (twisting) and bouncing somersault would also fit with the final disposition of the wreckage, especially with the nose section broken away. Certainly a combination of the two is possible, accounting for the tail ending up facing the direction of travel.
A simple wings level bounce over the trees is the least likely scenario.
A lesson learned from accident investigation, avoid hitting earth banks and trees. Neither will give an inch in a collision so if the structural damage doesn't get you, the instant deceleration forces certainly will.