Haha, no. There is no reason to worry. Babies know instinctively how much they need to eat. Their purpose in life is to gain weight, grow, eat and sleep...don't worry about nature.
Sleeping after eating doesn't really make too much difference: it's what is eaten in total calories during the day that matters. If you are concerned that you are feeding your child not enough or too much, you can ask the advice of your pediatrician on what to give her.
The well baby checkups should be setting her on the right curve for her length and weight gain if you are doing everything right