A good rule of thumb is to never feed anything larger than the widest part of the snake's body. Big ball pythons like that should do fine with medium-sized adult rats. It's not terrible if you feed something to big or too small on occasion, though. It's hard to get the exact same sized food item with any consistency.
However, I'd recommend only feeding pre-killed or frozen-thawed rodents if you're going to use larger rats. The bigger they are, the harder they're going to bite and scratch. I personally only feed thawed rats. If you go that route, make sure to thaw them completely before feeding. If they're still frozen in the middle when the snake eats it, it can be very harmful to their health.
Feeding once weekly will be ample. Some people feed less frequently when the snake is a large adult like yours is, such as every 10 to 12 days. Whichever way is easier for you will be fine.
She's certainly not overweight. These snakes can get up to 6 feet long and well over 3000 grams, although it's unusual. Very pretty animal.Good luck!
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