Sophia deployed her shadow field to search as much area as she could and used her ability to travel across the Ashen Barrens at her fastest speed. Her target was to first reach the area where Rein was seen for the last time and from there she could start searching for him methodically.
Sophia did not care about the monsters at all and did not try to avoid them. She took the shortest possible path and if any monsters appeared on her way, they were turned into minced meat by an uncountable number of shadow blades.
The more monsters Sophia encountered, the more worried she became. She had not encountered this many monsters when she was travelling toward the temporary base. Actually she had not encountered much danger except for a few monsters with decent strength.