They will poo less and shed less if they're not being fed enough too.
At 179g and eating one small/hopper mice every week is too little. She could easily be eating adult mice, or even jumbo mice or small rat pups. That would also jump start her growth and shedding process.
Age isn't really a factor in determining the size/frequency they should be eating. Underfed snakes will stay small even as they age.
Frequency depends on what you are feeding and if you are feeding appropriately sized meals, and size of their meal depends on the snake's weight and individual body proportion... For snakes smaller than ~500g, the prey's torso should be about as wide as the widest part of the snake.
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