▁J ama ica ) ▁is ▁a ▁Canadian ▁spr inter , ▁who ▁special ized ▁in ▁the ▁ 4 0 0 ▁metres . ▁She ▁won ▁the ▁bronze ▁medal ▁for ▁the ▁ 4 0 0 ▁metres , ▁and ▁ultimately , ▁led ▁her ▁national ▁team ▁to ▁claim ▁the ▁s print ▁relay ▁title ▁at ▁the ▁ 2 0 0 9 ▁Summer ▁Univers ia de ▁in ▁Bel grade , ▁Ser bia . ▁She ▁is ▁also ▁a ▁three - time ▁junior ▁national ▁champion , ▁a ▁two - time ▁silver ▁medal ist ▁at ▁the ▁Canadian ▁Track ▁and ▁Field ▁Championships . ▁ ▁Mu ir ▁made ▁her ▁international ▁debut ▁at ▁the ▁ 2 0 0 5 ▁Pan ▁American ▁Junior ▁Championships ▁in ▁W inds or , ▁Ontario , ▁where ▁she ▁captured ▁the ▁silver ▁medal ▁for ▁the ▁ 4 0 0 ▁metres , ▁with ▁an ▁impress ive ▁time ▁of ▁ 5 2 . 3 8 ▁seconds . ▁She ▁also ▁achieved ▁a ▁top - ten ▁finish ▁for ▁the ▁relay ▁team ▁at ▁the ▁ 2 0 0 7 ▁Pan ▁American ▁Games ▁in ▁Rio ▁de ▁Janeiro , ▁Brazil , ▁and ▁had ▁won ▁two ▁individual ▁silver ▁med als ▁at ▁the ▁national ▁tri als . ▁In ▁ 2 0 0 8 , ▁Mu ir ▁set ▁her ▁personal ▁best , ▁and ▁att ained ▁a ▁B - standard ▁time ▁of ▁ 5 1 . 7 7 ▁seconds ▁at ▁the ▁Harry ▁Jer ome ▁International ▁Track ▁Classic ▁in ▁Burn aby , ▁British ▁Columbia , ▁which ▁earned ▁her ▁a ▁qual ifying ▁spot ▁for ▁the ▁Olympics . ▁ ▁Mu ir ▁became ▁the ▁young est ▁track ▁and