Beautiful BP! It's great that she's eating well and she looks healthy to me though I agree she's getting a bit round. You could maybe increase the time between feedings to 10-14 days.
High appetite + infrequent poop for a BP her size is just a sign that she's growingOnce per month is also very normal for BP poop.
It's also normal for her to be acting hungry 1-3 days after eating. The smell of the rat lingers in the enclosure after a feeding which causes many BPs to stay in "food mode" for a few days - mine does too.
As she grows from 300-600 grams and starts eating bigger rodents she'll only need to eat every 14 days, and once she's reached 1000+ grams, you can taper off to feeding every 2-3 weeks. Once she's fully grown and a few years old, she may only need to eat every 3-4 weeks or when she shows signs of hunger (waiting with her neck out in an "s" shape like in your last photo).
Also, those speckles on her side look like normal markings to me. If you want to be sure, you can also look under her chin, around her eyes and heat pits, and at her vent for any black specks as that's where mites like to hide.
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