Why would a person come around you and frown at you?

I have a coworker who is female so am I she comes around me and wants me to talk to her but she doesn't like me. Example I'm working she is standing behind me frowning if I have use a conditioner in my hair She frowns at the smell. She has implied I stink etc. I use listerine after lunch open my mouth to reply to her she frown. She always comes around me staring either frowning shaking her shoulders even biting her lip. Why would someone come around you and they don't like you? WHY?!!