This is set in the movie Brave, please give them credit. I will just include Merida in my story thx.
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Merida cried on her mother. When she woke up, she saw that her mother became a human again. She hugged her and said "I'm sorry mum" in a scottish accent. When they got up, Merida saw a red wisp. She thought wisps are supposed to be blue. She followed the wisp.

" Merida, where are you going?" her mother said

" Mum, I'm following the wisps. They usually give you important information." Merida said

The wisps led her deeper into the Great Oak forests. When the trees started clearing away, she could see a faint glow. The red wisp led her to a clearing.

There was a small hut. She was curious. Wait, didn't the bear witch live in a hut? This hut was different. Instead of being made of wood, it was made of a strange blue crystals. She pushed the door open eventhough her mind was telling her to get out and run away.

Inside the hut was a large mirror occupying the wall. There were two tables with bags on them. She approached the table farthest from the mirror. She looked up. Instead of seeing her reflection, she saw a girl lying down on a tiled floor.
She gasped then approached the mirror.

There was a note tied to it.
Merida,
Choose a bag and go through. The world will end if you don't go in. The whole universe will shatter if you don't help her. She will save us all.

Will Merida trust this note? It may be a trick fabricated by an evil witch. Her gut says to be suspicious, but she will see if this is a tick.

She put her finger on the glass and carefully pushed. There was a glow and the mirror eeacted like water. She grabbed a bag off the nearest table and charged into the mirror. What will she find at the other side?
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p.s. This is a fanfic, so please don't sue me Disney thx