You are looking at it the wrong way round! You are asking a girl to love you, and to "show" that love for you.In other words you are wanting to "take" love from another person.Love is not taking! It's giving!
Show the girl, as much as possible, that you love her. That you want to help her, protect her. And ask for nothing in return.
Eventually, if she loves you, she will show that love.