Something to consider - throwing up doesn't really help you loose weight - lots of calories are absorbed before it comes out. Generally speaking throwing up tends to maintain or gain weight.

Little Miss - I would be concerned about 100 - my ex hit 99 and was 5' 4.5" - she didn't look healthy at all. Here eating disorder was out of control at this point.

Avoid any unhealthy eating and purging habits - see a nutritionalist to help plan something out..