Cat Kiss's?

Okay so heres a weird one..My daughters cat is infatuated with peoples mouths. Every morning I awaken to this cat sitting and stareing at me. Either she is on the pillow next to me or sitting right on top of me, just waiting for me to open my eyes. Then she comes right to my mouth as if she is kissing me. I believe she is smelling my breath. Why would she do this. When my kids were little I remember people warning me about cats smelling milk on the baby, but I have a allergy to dairy so I dont do milk. I have seen her do this to others also. The cat also has a habit of drooling.. Anyone elses cat drool?