To access this shrine requires you to navigate around the flowers, as Magda doesn't want you stepping on them.
Inside the shrine, step on the wooden raft to cross the first stream. Do the same for the second stream, but use Magnesis to ick up the treasure chest at the bottom. In the last room, you can use cryonis to raise the treasure chest so Link can open it. Use another block of ice near the destructible rocks, then use a bomb to blast through them.