If she is really your friend, she would LISTEN to what you have to say. And, as a friend she should take into consideration what you say. I would go up to her and explain to her about Backyard Breeders, Puppymills, all of the dogs at the animal shelter, etc...And she should NOT want to be breeding if it is esspecially a mixed breed dog! Don't worry about hurting her feelings, do it for the puppies, and all the millions of "unwanted" dogs in the world.

Oh, and convince her to get her dog spayed!