I'll begin with by saying that, in my opinion, poop is poop and it all smells and is gross! And, I too think it is a little strange or odd for her to make that decision but.....
it's her child and her choice.
To put it into perspective, and I think you'll totally understand this, I read in your 'a little about me' that you breastfed your son til he self-weaned at the age of 4. Many people probably think that was selfish and unrealistic and odd, but you know what? That was your child and your (and his) choice! I'm sure some people gave you a ton of grief over it and it probably annoyed or irritated you to have people trying to tell you what you should or should not do with your child.
Many people make it through life without eating meat and do just fine. Even if it seems strange or selfish to you, please keep in mind that it is her decision how she wants to raise her child, and try to be supportive of her.