sounds like you are not quite there yet...
Taking advantage of her ego means you must show her you are an alpha male with lots of of options, lie lie lie lie lie lie and lie some more but keep it simple...
example (this is a real conversation of mine):
me: hi, pick a number btween 1 and 4. keep it in mind. ok?
her: ok
me: is it 3?
her: yes omg bla bla bla
me: pick a number from 1 to 10
her: ok...
me: 7... muahahaha right?
her: yes... how did you do that?
me: mind manipulation

i would explain this to you but i don't think you want that (first ego bomb)
me: and i can do more... much more than that...
me: i can read you like a book, and you look quite interesting he he (2 ego bomb)
the last 3 messages were send one after one, flood her head, for her to make more and more interested in what i have to say about her. When she is interested in what i have to say about her that means i have to make her take "the cube" but first a talk some all general shit.
her: ha ha please read me (that means i have to make her work a bit more)
me: not much... you fell a bit lonely, sometimes when you smile your eyes are sad, even if you show a strong and hard shell you are very sensitive a gentle (general shit i was talking about)
me: lips can lie but your eyes don't
her: how did you know that?(i like to ignore this one)
me: but everything is going to be ok, trust me...
me: i could tell more, but truth may hurt a lil bit (huge ego bomb)
->now is time for the cube...
the-cube-vt1509.html
Use her ego in your favor.
After you are really sure she is into you and she really likes talking to you ( after you make her take the cube) say to her that you have a friend for her appealing to her ego and your alpha male status
"You know what? I know a great guy for you, he is harmless and funny, not like me, toxic and evil"
Why would you do that? Because she will think that you are a challange for her, she will need the urge to take you for her.
VERY IMPORTANT!!! USE YOU OWN WORDS!!!
the principle is important, understand how this ego thing works.
Is it clear?