conseil

So like my friend likes this guy but they are completly different
she is a nice girl and he is a trouble maker and is mean to everyone except her. Recently she gave him a note saying that she likes him but he has not replied yet. She has been curious ever since. I want to help her but her best friend a dit not to because they don't go together. Also my friend a dit not to because she doesn't like him anymore but I could tell she's lying. What should I do?