Cats are beautifully independent creatures. They love doing what they want, when they want, without anyone asking questions. They take pride in their independence, and they will not give said independence away very easily. Which means that when they do, when cats ask humans for help, that is a sign that they really, really need it. And although it doesn't happen very often, it seems that of the times that it does happen, often, it is pregnant cat mommas asking for help.
It may seem to us that giving birth as a cat is an easier process than it is as a human, but it definitely doesn't seem that way to said pregnant cats. And when it comes to protecting and feeding their babies, momma cats will do anything, including asking a human for help and giving up their independence. They only need to make the right choice - to choose the right human to ask for help, and the momma cat in this story certainly chose well.