Thank you for providing the information. Based on your friend's Instagram post, she has three new babies. You can send her a congratulatory message, expressing your happiness for her and her new additions. If you want to add a light-hearted touch, you could also mention her desire for a cat. Here's an example message you could send: "Hey [friend's name], I saw your Insta post about Lisa and her adorable new babies! Congratulations to her and to you as an auntie! I'm so happy for them. And hey, speaking of babies, have you thought about getting a cat yet? I heard they make great companions! 😊"