Time Travelers: Back to the past

Alexandria (Or Alexa for short) Jones is your average 7th grader. She can be immature and clumsy at times, but everyone still loves and adores her. One day, while following her daily routine Alexa tripped over her untied shoe and almost fell down a staircase. Any normal person would've injured themselves but Alexa didn't. She closed her eyes, and when she opened them she was back on solid ground. Almost as if she teleported. She thought it was just her imagination so she didn't think much about it until an accident occurred and she woke up in a hospital with a strange girl waiting for her to wake up. Alexa asked one question. And the reply was 7 words; "I am you and you are me." What kind of future awaits Alexandria after hearing those frightening words?!