As time went by, my worry subsided, Pilo has been a good mother to all her kittens! She's been taking good care of the up until now. It seems that, eventhough she's still 9 months old, her maternal instinct is excellent! Well, as the vet said: "Usually, becoming a mother will awaken their maternal instinct. And as I see it now, Pilo is such a good mother."
I can't stop feeling proud of her. May Pilo and her kittens always be happy & healthy!