Based on the message, your friend is mentioning that Lisa shared on Instagram that "her Tatze" (which seems to be a pet name for a cat) had 3 babies/kittens. The message says "Ihre Tatze hat 3 Junge bekommen" which translates to "Her cat has had 3 young ones/kittens." So if you want to congratulate your friend Lisa, she has 3 new kittens. However, it sounds like the message is actually from another friend telling you about Lisa's cat, not directly from the cat owner herself.