In the final shot of season six, you could make out sails showing Ellaria's Dornish sigil (the sun spear) and Olenna Tyrell's golden rose sigil. This means there was a time jump between when we saw Varys in Dorne with Ellaria Sand and when Daenerys set sail for Westeros. 

Ellaria and her daughters (Obara, Tyene, and Nymeria) killed the leaders of Dorne on season six. Doran Martell and his son Trystane were murdered, and Ellaria said, "No man will ever rule Dorne again." Could this decision come back to haunt her?