Well, I'm not her doctor but in my opinion we have come so far as a society into a culture of obesity that we wouldn't recognize a healthy weight if we saw it.
She's tiny but really, 117 pounds is NOT a starvation weight. On some weight charts it falls within the normal range for her height. If she regains three pounds she's at MY goal weight and she is one inch taller than I am and MY doctor's likes my goal (unless he's lying because he thinks I'll never get there

).
Helen seems fine to me. I've been reading this all over the internet that she's so amazingly thin and to me unless I'm actually sitting with her in her doc's office when he/she gives Helen the news that she's needing to regain 15 pounds, I'd take that with a grain of salt.
Most of the BL contestants seem a little thin to me at the finale and to some extent I think they actually have deliberately dieted down to below where they expect to eventually land because, well, they want to win, but I still believe that our culture has a viewpoint that everyone who is not obese is anorexic or overly thin.
I think people are just projecting their own weight frustrations on Helen.