The Skipback: A Short Time Travel Story

Do you want to get a good reading in, but only have 15-20 minutes? 
Want a full story but don't want to read for days and days? 
This short story is for you!

Charlotte has been gifted a time travel device that lets her skip back 5 minutes into the past. Traveling back to earlier in the day, she runs through different scenarios over and over. What does she change? What would you change if you could go back in time?