Answer: Hippocampus
Explanation:
Hippocampus is the part of limbic system that persist in brain's structure.This part helps in learning,memorizing, motivating etc. Damage caused to hippo-campus due to accident , disease or any other factor can result in memory loss, lack of ability to memorize, having long term memory etc.
According to the question, Shelby might have damaged her hippo-campus in car accident because she lost her ability to transfer information from short term memory to long term memory.
