After I had my first baby, I lost all my pragnency weight (30 kg) in 1 months. Then loose a little bit more during couple of months that I was breastfeeding. I believe that rather than eating more healthy food. Resting is also the part of weght lost. Anyway, to be certain that nothing wrong with her help. I agree that she should go get a check up with doctor. Then she might need more help with her children so she could have more time of. Healthy body come from healthy mind.