I know about Raleigh and the Roanoke Colony, which certainly did launch during Elizabeth I’s reign. And you’re correct that the Queen invested in Raleigh’s enterprise for that colony.
But her involvement was just an investment, and she did that mostly as a favor to Raleigh since she was impressed by him. I doubt she knew any details.
Plus, there’s no documents showing Raleigh planned on slaves there. I doubt that there were plans for slaves. None at that time knew the American colonies would prove to be a source for things like cotton/tobacco.