I'd be happy to help you out! Your friend is talking about someone named Lisa, who shared a post on Instagram about her cat having kittens. The phrase "Ihre Tatze" means "her paw", but in this context, "Tatze" is a common colloquialism in German for "cat". So, Lisa's cat has given birth to 3 kittens. You can congratulate your friend on Lisa's new kittens!