She doesn't have much sense of personal space.  She has learned that a cat makes a comfortable pillow.  Surprisingly, Theo often seeks her out.  I guess he finds it comforting to lie next to her warm body, although he sometimes finds himself under her head or with a big paw resting over him.  Sometimes she tries to play too rough, so I have to supervise, but she also grooms him affectionately which he seems to enjoy although later he has to smooth down his fur and groom off all her friendly slobber.  Finding them curled up together is so lovely.