Ball python is not shedding

I am new to owning reptiles and this ball python happens to be my first reptile pet. I purchased this hatchling a month ago and the pet store said it was at the store for two weeks before I purchased her. She has been eating hoppers and has no loss of appetite I feed her every 5-7 days humidity is at 50-60 percent and temp on hot side is 90 cool side is 75-80 the snake is showing no signs of shedding. I have been reading and doing research and from what I understand she should be shedding every 5-6 weeks. Should I be concerned?

They shed when its time there is no established time frame to follow

They she'd if they grow and they grow if they are fed approprietely.

Hoppers is the food generally used out of the egg, in no time the animal graduates to a larger prey.

Now the question is how big is this hatchling and is the prey offered still appropriate compare to its size

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I have not weighed her she is about 20 inches long and is 2- 2 1/2 inches in girth at her thickest point head is about one inch long and 3/4 inch wide

Get a digital kitchen scale that measures in grams. You can find them at Walmart or Amazon or Ebay for less than $20. A great investment. Then you can weigh your snake and prey. Some people don't bother with weighing prey and just go by eye-balling the size, but I know from a first-timer's experience, the scale and weighing the prey for the first couple of months really helped me feel more comfortable that I was giving my snake the appropriate meals. As for the shedding, don't worry about it. You'll know when it happens if check on your snake daily. Once you see those eyes get foggy or blue, make sure to bump up your humidity and don't handle it too much. I still offer prey on the regular feeding days during shed, but if they don't take it, don't stress, just wait until the next feeding day.