If she is a hobby demo, does she count on your orders to fill her quota?
If not, it might be a relief for her not to be anybody else's demo. She might actually be hanging in with you because she feels that, as your friend, she ought to do so and would be glad not to have to deal with coordinating your orders with hers.
If she is counting on you to help her keep her demo status, then the situation becomes more complicated.
A hard thing to talk about, but maybe you ought to talk to her very candidly. But lovingly. You'd have to think about how to approach it.