It's pretty big for 3 mos, but not unheard of. My experience is that feeding heavy the first 6 months will not cause long term problems. What exactly powerfeeding is can be debated. I wouldn't worry too much about her weight, and instead worry about her shape, and correct it SLOWLY if need be. Sometimes hatchlings are born much larger than average. Sometimes hatchlings have an insane metabolism and growth compared to the average. You have to take your individual snake into account.
If you were to take a cross section of your snake, it should be pretty close to an equilateral triangle with somewhat curved sides. If it's more like the letter D on its side, or worse, an O, there is way too much fat reserves. Stick with weekly feeding, but I would feed something smaller than what you would normally feed one that size until she is the correct shape. It could take a long time.
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