Good for her for trying to put on weight.
This is going to sound weird but it is a true story. I always, ever since I've been in 7th grade, been 115 lbs and 5'9". This was actually fine. My sisters, mother aunts, grandfather, etc. were all exactly the same, and no doctor was ever worried about me. But then I had my kids. I had very difficult pregnancies and both were born prematurely. I breastfed them both for 14 months each. My health really suffered and breastfeeding really took all the nutrients out of me. I now weight 103 lbs. My doctor and I have tried everything for a year to get me to gain weight. I take extra iron, I've been on the milkshake diet, I've eaten more protien. I just can't gain my weight back and it's been so frustraiting. The biggest embarrasment is that everyone thinks I am anorexic and feels the need to comment on my weight, and then I feel like I need to explain everything to everyone (sigh).
I have bonded with my cowroker who used to be heavy and lost 150 lbs and now everyone asks what kind of cancer he has.
I guess the point is I know the battle to put on weight, even though my problem was the breastfeeding. It just makes you feel that everyone is judging you all the time.