So I was in Roricksted doing "A False Front." Sissel came up, "I had a dream that there was a good dragon." Just then I heard wings flapping and looked up to see Durnehviir flying overhead. Sometimes he seems to stay summoned for a long time after his name is shouted. Anyway it looks like her dream came true. If she looked up she would see a good dragon.

durnehviir is a very ugly dragon maybe she meant alduin or ancient dragon

I know it was Paarthunax, Durnehviir wasn't even in the game when Sissel originally said it in vanilla. Although Durnehviir is also a good dragon that she had now seen.