It sounds like your friend's cat, which I assume is Lisa, has given birth to three kittens, as indicated by the statement "Ihre Tatze hat 3 Junge bekommen." The word "Junge" typically refers to baby animals or offspring, and "3" clearly indicates three of them. So, your friend's cat has indeed given birth to three kittens. How lovely! If you want to congratulate your friend, you might want to acknowledge the new additions to her feline family and express your wishes for their health and happiness. Would you like some suggestions on what to say?