She's 85 lbs. Even if she's 5 feet tall (which I'm pretty sure she isn't), that's a BMI of 16.6. If she's 5'4 or so her BMI would be 14.6. That's not low end of normal or borderline, that's severely underweight. You sound like fats who say they're 'normal' because they don't look obese or unhealthy.