I gave Yenna food and then she came to the camp and I let her stay. I spoke to her twice during the long rests before I went to the lower city. After some time I went back to try and talk to Grub, her cat, and after speaking to the cat she isn't anywhere to be found. There is no quest dialogs in the journal, no one gave me anything, there's nothing to hint at her disappearance. Is this a bug or will she come back later on her own?