i think you should motivate her just like everyone else, tell basic good things about bitcoin, don't tell any bad things about bitcoin, and i am sure that she will like it
Yes that is the way it should be tell her everything good about bitcoin. I do not know of anything bad with bitcoin. Only that its price is unstable and unpredictable. But all in all it is very much like for me more than paper money as you can use it almost everywhere now. It is so versatile and you could manage it on tips of your finger. You could do the trading, investing, and earning with it.
That is going to motivate them to use bitcoin as they are going to know that good things about bitcoin and just tell them that you can use it as a way of convenience. It is just like money in paypal but it has lesser fees that you are going to pay so you can save a lot of money instead of paying those overcharge fees.