I don't recognise this 'advert', what is it for?
In reality, she sounds flattered. Why don't you pluck up the courage to speak to her? You sound very young. If 98 is the year you were born, then 17/18 would be correct? Just tell her that you like her top/bag/phone, whatever pleases you. She'll be flattered and it will maybe open up a conversation between you. Teenage girls are much 'older' than teenage boys and better at conversation, so think before you open your mouth. You don't want to look like an idiot!