Good for you for trying to educate her!!
I've pretty much have given up on the whole teacup and breeding thing. I can't tell you how many people I have tried to explain to that there isn't such a thing as a teacup, there is only one standard for a yorkie. Very rarely do they listen.
But what is worse is those who want to breed their 3lb yorkie and you try telling them how dangerous and unhealthy it is. They just don't listen!!
For example, I know a girl on facebook that has a 2 1/2lb yorkie girl that was just bred. She is fairly new to breeding and I told her way ahead of time the dog shouldn't be bred. Obviously she didn't listen.