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I wouldn't risk it - she docks at 6.30, she has to clear security and customs before they let you off and then it is 30mins to the airport. The earliest flight time recommended by RCI is 11.30 if that gives you a clue......
Although I wouldn't feel comfortable myself I think you can make it. Every RCI ship I've been on the the last few cruises, they have been disembarking pre 0700am. Make sure you get a priorty 'first off' tag from the desk, have a pre booked cab & I think you could make the airport by 0800hrs. Good Luck!