At the lake, she was swimming in

But something happened to her to caused her to revisit her old school

She drowned in the lake and she woke to her high school years as an adult

Her memory was shattered from drowning

In her teen years, she was a loner so she just drifted into herself and she had a friend in high school who just wanted to get what he wanted from her so is this her chance to relive her school year?