so you can give her advise, but not order.
"dear girl friend, i advise you not to do so, however it's your own right to do so or not to do so. if you did so, blar blar, if you did not do so, i will definitely be very glad because blar blar. all my advise is my own opinion and is from my own education and expirence, for your information only blar blar"