According to the search results, the top scorer in the 2014 FIFA U-20 Women's World Cup was Asisat Oshoala of Nigeria, who scored 7 goals in the tournament. (Source: Wikipedia, FIFA)
Here's an image of Asisat Oshoala in action during the 2014 FIFA U-20 Women's World Cup:
Image: Asisat Oshoala of Nigeria in action during the 2014 FIFA U-20 Women's World Cup
Oshoala's impressive performance in the tournament earned her the Golden Boot award, and she was also named the Best Player of the tournament. (Source: FIFA)