I still haven't decided, I wish there was something new coming out...then it would be a lot easier to say no....
Take away the fact she's pressuring you and imagine you're being offered it by some random person and imagine what you would do. I think the fact you know she's pressuring you is making you make the wrong decision.
Tell her you are not interested in it, but thank her for the option! Maybe you should offer to sell it for HER. Then charge her a small fee for your services... I think that would be fair!