Your friend has shared the wonderful news that she has given birth to three baby girls. The use of "Tatze" in German refers to "kittens," indicating she's also welcoming three new kittens into her family. It's clear she's thrilled about both her human and feline children and expresses her joy by intending to share the news and include a cat among her celebrations. To congratulate her appropriately, you could say something like this: "Congratulations on the arrival of your three adorable little girls! Your joy must be overwhelming with the addition of both your sweet human babies and playful kittens. I'm so happy for you and your growing family. Wishing you all the love, health, and happiness during this exciting new chapter of your life!"