Yara and Theon told Danerys about Euron at the end of season six, so they would have to be aware that their crazed uncle was coming after them.

More importantly, Dany has learned over the last six seasons how to think at least one step ahead of her adversaries, and would have at the very least committed forces to patrol the island and Blackwater Bay. I wrote in more detail here:

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Ad agency creative director, writer & designer at https://guttmanshapiro.com. Former pro tennis player and peak performance coach for professional athletes.

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