at first, excuse me for my bad english, I hope you can ignore it

I read through the whole Support-Sub and couldn't find a topic that could help me, google couldnt help me, too.
I have a bug that a lot of people get, but a little bit different I guess.
I completed the quest "Hard Answers" where I talked to Kalirah and Enthir in the Forzen Hearth Cellar in Winterhold and then Karliah left the building. Right at this moment a Dragon attacked Winterhold and I killed him, then went to Riften to meet her. She wasn't there. The Quest "Hard Answered" was marked completed in the journal though.
I googled for help and tried all the possible solutions, like move her to the Red Flagon Main Room and setstage etc. etc... I played the whole quest again ( the quest already absolved in the journal and still in progress, too... so... two times in journal ) but it didn't work as well.
I even tried to ignore that and start the next Quest with getstage tg07, but it didn't work, if I move Karliah into the Flagon she just says "Hmm?" and keeps walking away. I can't find no solution. And I have no Savegame before all that.
And seriously... its my third run to play this Game and I don't want to start all over again

Does anyone have an Idea how to solve it or maybe skip a few steps to get into the "Pursuit" quest ( the next one )? Is there maybe a way to fix it with the Construction Kit or something? I never used it and I am a poor noob in programming/modding and stuff.
I hope anyone has an Idea.
Thanks!
