How to Complete Watch Out For the Flowers
South of the Wetland Stable is a shrine on an island in the middle of Hylia River. A lone female NPC, Magda, stands next to flowers that surround the shrine. If you step on the flowers, she will scold you, beat you for 3 hearts of damage, and you will be reset to the beginning.
Work your way around the flowers, or use Revali’s Gale to glide straight over to the entrance to complete the Shrine Quest and gain access to Hila Rao Shrine.