In summer 2011 , she could not keep up with friends and after almost collapsing during hiking , she went to see her family doctor .
Campbell had been diagnosed with asthma at the age of 14 .
In summer 2011 , Campbell could not keep up with friends and after almost collapsing during hiking , Campbell went to see Campbell 's family doctor .
Campbell had been diagnosed with asthma at the age of 14 .