It's like when I was a teen and my mom would start quizzing me about my friends "where do they live? what kind of shoes do they have? where does their mom work? on and on..."
Only it's just Pica reading the smells of this other cat. Now and then she will look up with her mouth open ... I think to huff the smells more deeply in some cat way.
I tried petting her but she ignored me and kept *smelling*