It seems like your friend is excited about someone else's news on Instagram. Based on the text, I can tell you that "Tatze" is a colloquial term for cat in German, and "Junge" means kittens. So, according to your friend's message, Lisa's cat has had 3 adorable kittens! If you're looking to congratulate your friend, however, it seems that it's not actually her babies or kittens. The message expresses her desire to have a cat, but there's no mention of her having new babies or kittens herself. If you want to respond, you could say something like "Aww, das ist süß!" (Aww, that's cute!) or ask her about getting a cat, but there's no need to congratulate her on new babies.