Well this happened to me also not your quest but how I fixed mine,Delphine the Blades quest girl well the whole quest thing was bugged from the start the inn where you meet her and ask for the attic room and she says there is no attic room sleep in the room on the left ya right there was no floor just past the book in counter right to the dresser and beds they where there suspended in space so if you jumped and fell short you fell down through the blue void and ended up at the door entrance every time.I'm getting there, its long....well let me tell you its a quest breaker because she falls through too so what I did is got the jump that lets you jump 350 and made it to the bed slept 4 hrs she then went into her dialog and caught her before she fell through went down stairs with her then advanced the quest dialog went to leave the inn and she fell through the damn floor again....reload this time ran ahead of her out the door first and waited till she came out and she did fast travelled to the town to go see the first dead dragon resurrected and she looped out and did not advance her dialog reload.......this time I loaded the game through skse loaded directly also took out that deadly dragon mod because the resurrected dragon just froze also and then she did everything normal advanced her quest dialog and moved on. now I have since then run into other bugs but not really quest breakers yet :) this was also posted on another topic but belongs here Happy gaming :)