I agree, Dany's story is painstakingly long in Mereen, Yunkai & Astapor. Her goal was to raise an army and bring them to take the iron throne, and now with Kings Landing at it's most vulnerable point, she sits and waits. I get that the ships burnt, but she has cities and thousands on thousands of soldiers and regular folk that can build enough ships to get her there. It seems like the best time to attack right?