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After getting to the mountain, you will come across a room with three boxes; two of them being "alive" and one which is a wooden crate. Now, in order to progress you'll need to be move the two alive boxes, with the help of Mui and some fire.
First what you need to do is move the wooden crate to the right, until you're really close to the bean-shaped rock above. To the right, you'll see the white rollies which you can control with Mui's help, and which trail acts like a fire conductor.
Now the solution to the puzzle is to first retract the bottom box, and then the top box, so that Lana has enough time to drag the wooden crate on top of the bottom, climb on it and then on the ledge. In order to do that, you will first use Mui's ability on the rollies, which will give Lana control over one of them, and then you'll carefully leave the trail on the wooden crate and all the way over the bottom box.
After doing that, roll your way back and on top of the wooden crate. Now your goal is to move to the bean-shaped rock above the crate, and cover it in the trail while moving counter-clockwise, going around and then to the top box. The idea is to leave the trail over the top side of the rock while leaving the bottom clean, directing the fire to "go around" and delay the retracting of the top box.
After you make sure there is no empty spots that would break your fire, roll your way down to the crate and then towards the fire. When the rollie catches on fire, it will start to slowly spread, first to the wooden crate, then to the rock above. After it starts moving on the rock, start dragging the wooden crate to the left and on top of the bottom box after it retracts.
As you delayed the fire and the bottom box retracted first, that means it will reappear first as well, allowing Lana to jump up on the wooden crate and on the ledge above, all before the top crate reappears.
