The best ending Dany could have hoped for would be to step aside and let Jon have the Iron Throne, and then go back to Essos to rule there with Daario as her husband. She could have even done it with two dragons left to her.
But no, pretty sure she's dead. Pretty sure she's going to stay dead. If she did come back, that'd be terrible for everybody.
I don't know, I suppose anything is possible. There were so many things that didn't make sense at all, and so many other things that just felt like pointless fanservice, I really couldn't care less.