I skimmed your post a little, but the impression I get is that on the one hand your friend feels her clock begin to tick and is having those baby hormones. On the other hand, she's smart enough to know that she and her BF have sort of a party/slacker lifestyle, and that doesn't mix with a baby at all. So she's channeling her baby desires into her dogs. Not a perfect, optimal way to live your life, but it's actually responsible in its own way.
This is my nonconfrontational self speaking, but rather than confronting her, why not try to open a few windows into a healthy lifestyle. Do a "stroller run" with your daughter, and have your friend and her dog come along. Make sugar-free fruit smoothies together. Etc. She sounds like she needs a confidence-boost, not a full-scale intervention, but I'm not a big intervener, so that could just be me.