In addition to the exclusion noted by shriekingviolet, we can lay out clues 5, 7, and 8 like this (I've included the positive relations already in the grid):
Traci = Mongolia -> ? -> Gwendolyn -> Amelia
Leon -> ? -> Ecuador = Brittany
Although excluding Brittany from June might be enough to solve the puzzle after tranposing that exclusion to Ecuador, the above relationship gives you two more Xs.
Traci cannot be Leon because Gwen and Brittany are in the same category and the same distance from Traci and Leon. And because Traci is Mongolia, Mongolia cannot be Leon either.
This leads to the solution.
Last edited by zenobia43; 06-17-2013 at 12:58 AM.