I've just read the book Nightingales vol.2 and found out Karliah is The Nightingale's grand daughter. WOW, just wow!

I completed the Thieves Guild questline and became a nightingale so here are the questions:

1 - Where is she? I returned to the Ninghtingale Hall but she's not there and there's no portal to The Twilight Sepulcher as it was said there would be. Is this a bug?

2 - Can I marry her?

she is supposed to be in the nightengale hall or so she said.

no I do not believe that you can marry her.

No you can't marry her,she is in love with the old Thieves guild master(Gallus).Too bad he is dead.Also i found that strange too i tried search on wikia,but doesn't say anithing useless.

It's bugged. For some reason she gets stuck where you first met her, and she stays there instead of going back to the hall. Wish I could marry het as well though.

She tells you she's been accepted back into the guild after 25 years and she's amazed.So perhaps a little crime-spree the likes of which hasn't been seen in decades is in order.....

It's not bugged and she's spoken for , but maybe for the sake of the PC she's not out in the world in competition with you if you actually keep doing the thieves guild quests , rebuild the guild all that.

Instead of going back the Nightingale Hall she gets stuck at Snow Veil Sanctum , apparently. I think this svcks personally, I want her to hang out in The Ragged Flagon with the TG She's one of my favourite NPC's.. Behind Delvin of course. He's so badass.