Here's how to understand the message: "Omg!! hast du mitbekommen was Lisa auf Insta geteilt hat? " Translation: "Omg!! Did you notice what Lisa shared on Instagram?" "She has 3 kittens now. The little ones are sooo cute." Translation: "Her cat has 3 kittens now. The little ones are sooo cute." From this, we can conclude that your friend's cat, Tatze (presumably Lisa's cat), has given birth to three kittens. That's why when you want to congratulate her on her "new babies," you're actually congratulating her on the cat's new kittens.