Compliment her back but it has to be a genuine compliment dont just make something up just to say something nice. People tend to like people that like them. So if you give off the impression that you like her(doesnt have to be in a sexual way or a relationship level "like") she will probably like u back. Also people like to be complimented on their personality and achievements more than their appearance unless it is a part of their appearance that they like ex"god. I really like my teeth those braces made my smile perfect" ex compliment "has anyone ever told you that you have a beautiful smile" also avoid compliments such as "you look great today" today implies that they look better than they usually do and can be taken as semi insulting. Complimenting people and getting them to like you is a key step in forming a long lasting relationship. Also as a side note do not disagree with her opinion. It is okay to argue a point with a person if that is what there intention was but do not ever insult the opinion of a person you are trying to be friends with. No one ever wants to hear "you are wrong" or that was a dumb idea". If she says "im christian" dont say " well you realize the bible cant possibly be correct" if she says "i like icecream" dont say " i dont or it's unhealthy for you" the only time you should disagree with someone on their opinion if you want them to like you is when they are looking for positive feed back about their insecurity ex"my nose is ugly" ex good response "no its not it makes you look cute" hope this helps and good luck