It sounds like your friend is excited about the news! From the message, it seems that Lisa's cat (or "Tatze" which is a term of endearment, likely referring to her cat) had 3 kittens. So, you can congratulate her on the birth of 3 adorable kittens! Here’s a suggestion for your message: "Herzlichen Glückwunsch zu den 3 süßen Kätzchen! Die Fotos sehen soooo liebeäßig aus. Super News, ich freue mich so für euch! 😍" I hope this helps!