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?
The thing that was throwing me is if you look real close there is a decimal point between the 3 and the 7. So wasnt sure if it was 3.7