It seems like your friend has given birth to kittens, as she used the Filipino phrase "Ang pusa ko ay kakapanganak lang nang limang kuting." In this sentence, "pusa" means cat, "kakapanganak" means gave birth, and "limang kuting" means five kittens. Therefore, your friend's cat has had five kittens. To congratulate her, you can say, "Congratulations on the new additions to your family! I'm so happy for you and your cat. Five kittens must be a handful, but I'm sure they'll bring you lots of joy."