hi hotpink, kittens need feeding at least 4 times a day when they are mall. Give them a little and often. it might be that you aren't feeding her regularly enough?
i have 3 kittens (now 4 months old) and they get fed 3 times a day now. We use an electronic feeder for their lunchtime meal as we are both at work, but they love it! They hear the sound of it opening and come running!
all 3 only 'chat' to us when they are really hungry, then there is a chorus of miaows.