itch.io

Let's see: I assume you have learned the pocket dimension spell from the book already. If that's the case, talking to her should bring up the option to ask "Do you want to live with me?". After that, you should go to your house in Tarkas. In your uncle's study there should be the pocket dimension book on the desk. From there, you can make a room for her (if you have the money). You should get a cutscene after that, and she moves in, if I remember correctly.