Gather all your courage and do the first step, then be yourself.
If I can give you an advice is to be kind but not servile, not refuse yourself trying to make her like you more, because if you do, she'll probably get annoyed, and you definitely don't want this.
Also, not be monotonous when you talk with her, always try to make her laugh, to surprise her.. Be nice.
And, if there is a general rule to make a person appreciate you, it's to act in a way you'd appreciate yourself while trying. It definitely works