It seems like your friend's message is in Filipino, and she's talking about her cat giving birth. The phrase "Ang pusa ko ay kakapanganak lang nang limang kuting" translates to "My cat has just given birth to five kittens." So, your friend's cat had five new babies. To congratulate her, you could say something like, "Wow, congratulations on the five new additions to your family! I hope your cat and her kittens are doing well."