An instructor at the Bnei Tzion pre-military academy told those close to her that she voiced opposition to the hike in Nahal Tzafit (the Tzafit Stream), due to the weather warnings, Channel 2 reported.
The 25-year-old instructor, who had been arrested, was released to house arrest.
She claimed to have warned the academy about the dangers, and asked to cancel the hike.
Investigators discovered that she had also voiced concerns to her father, a deputy commander in the Arava's Rescue Unit, which took part in the efforts to find and rescue the teenagers after the accident occurred.
Meanwhile, hiking routes in the Negev and Arava regions, as well as in the Judean Desert, are still closed to visitors. An exception is Masada, which is open except for its "Snake Path."
Former and current students of pre-military academies on Saturday night held a memorial event at Tel Aviv's Rabin Square, lighting candles and singing songs in memory of the teens who were killed on Thursday in the flooding.