From what I read she didn't decide: she tried IVF, it just didn't work.
Here's a breeder with direct evidence that shitty things happen in this world and furthermore they can happen to your children, and she thinks it's a good idea to bring children into the world. I will never understand that logic; I usually assume they're just in denial about what kind of a place the world is, rather than insane gamblers who will keep playing even when they see the house always wins.