What do you do or would do?

I have the sense that a person may be uncomfortable around me, maybe not even not like me a little. Today our mutual friends our celebrating her birthday. How do I make her feel comfortable around me or do be careful around this person? I am feeling a little uneasy around her. I dont not like being unliked and when I feel this way I want to not like this person too because they do not like me. ANy suggestions, kill her with kindness?