I agree with what these other ladies have said.
Going to the landlord is your first step. Keep a journal of the occasions that the neighbor knocks on your ceiling. That way you can accurately document times your neighbor does this, and the activities your family is doing at the time. Ask the landlord who was living in your apartment before you. maybe it was a person with no kids who was never home and the neighbor needs to adjust. Ask the landlord to install carpets in your apartment... they help to deaden the noise.
I'd also tell the woman to call the landlord if she has a complaint, and to stop knocking on your ceiling or YOU will complain about HER to the landlord. Your noise is not malicious.. it's the noise of living. Her noise is malicious and intrusive, and you need to involve the landlord. I'm amazed that she is presumptive and rude enough to be giving you mothering advice! Don't let the woman intimidate you... As long as you make sure your kids keep their noise to respectful levels, you have nothing to feel guilty about.
Now.. not that I recommend it, but I had a downstairs neighbor that used to crank his music all night long. When I complained to him, he said that he worked days and it was his lifestyle and I had better get used to it. My solution was to lay my speakers on the floor and crank the base all day long. When he complained I told him it was my lifestyle and he and better get used to it. His music got much quieter after that.