This is younger Lei Fēng, right now in this drawing. This is where she gets her vision. What is happening tho. To understand imma have to explain the before.  So her mom died  when she was six, her dad re-married this woman from Mondstadt hence why her dress is like that. Her family was very wealthy. Her stepmom wanted Lei to do everything she told Lei, she had to follow everything. She couldn't even choose her own path in the future. Everyday she would try reason with her stepmom and her dad, hoping that their opinion would change. She would get beaten for that always. After that she would be sent to her room to study. 6 years later, she didn't go to her room and instead into the garden where she saw a trapped butterfly. She helped it and then became good friends with the butterflies. After 3 months, she realised she could be free like them, only if she dared to go bug her parents twice in the same day. She never expected to get a vision at that moment, which also meant she wasn't aware of what would happen next after her vision appeared. What happened was the whole building, a whole sturdy house, collapsed. Everything destroyed, her dad, stepmom and servants hurt badly, some servants even dead, and she stood there in the midst of it. Not even a scratch, the butterflies protected her and her siblings. Her and her siblings ran away with one of the servants who survived. Her name wasn't even Lei, it was actually Xiù Fēng. She changed it Lei as she didn't want a name that reflected her past. Specifically Lei as she felt it resembled the storm she had caused, the storm of her strongest moment in her life. She kept Fēng as it showed what kind of storm she caused. 

I also have a Gacha version of her as well :D

This is where she freed the butterfly btw.