I already did every available fight and Claire is in the Manor. And I still see no sign of that gobbo.
Has she appeared in the morning after you slept? You might have to just do a normal sleep, not sleep with someone.
If you've already woken up and found her there (twice), did you look for her around the manor?
Look for her where, exactly?
You need to go to different areas on the map, and find the option "Look for signs of Lyx" There will be several spots you need to go to