at the september 2014 uci bmx supercross world cup race in california, walker had a fall and suffered a serious head injury. whilst her helmet cam recorded her calmly giving detailed accounts to medical staff of what happened to her, she has no recollection of the entire day. she had daily headaches for the next six weeks, and it was five months before she received medical clearance. as of february 2016, walker has experienced a total of 15 fractures during her bmx career.