Your friend mentioned that Lisa's baby has 3 babies! It seems there might be a little confusion in the text. However, the main point is that Lisa is the one who had babies, and she is expecting 3 of them. So congratulations to you and Lisa on the upcoming birth of her 3 little ones! If you'd like to congratulate your friend, you can say something like: "Omg!!! Did you see what Lisa shared on Instagram? She's expecting 3 babies, and they look so adorable! Congratulations to her on this wonderful news!"