There's 16 ounces in a pound, not ten, so it's not 3 ounces, it's .37 pounds, a little over a third of a pound. 3 ounces is less than a quarter of a pound. Going by kg (which makes a much more accurate conversion), she's just over 1000 grams instead of under. She still seems a bit too skinny. Have you been keeping track of how much weight she's been losing while refusing rats?