Based on her statement in Tagalog: "Ang pusa ko ay kakapanganak lang nang limang kuting." This translates to: "My cat has just given birth to five kittens." So your friend is saying that her cat had 5 new baby kittens. The key part is "limang kuting" which means "five kittens." To congratulate her properly, you can say something like: "Congratulations on the new arrivals! Five adorable kittens, how exciting!"