It seems like your friend is excited about her friend Lisa's cat having given birth to three kittens, as mentioned on Instagram. She is expressing her desire to also have a cat. So, in this context, there are three new baby kittens. To congratulate your friend on her new babies, you might be a bit confused because it seems like she doesn't have any babies herself, but rather is excited about her friend's cat's babies. However, if you want to respond to her excitement and support her desire for a cat, you could say something like: "Wow, that's amazing news about Lisa's cat! The kittens must be adorable. I can understand why you'd want a cat too – they're such wonderful companions. I hope you get to find the perfect little furball soon!" This way, you're acknowledging her excitement and supporting her wish without getting the details of her own situation mixed up.