I've got a female that's over 3000 grams, and it's not unheard of for mature adults to weigh 4000+ grams.
Based on her age, she is small, and if you could, I'd recommend changing her over to a small rat once every 7 days.
With that said, she doesn't look emaciated, but underweight females (for their age) tend to catch up for lost time once they are able to eat a more appropriately sized meal on a more frequent basis.
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