I also personally think she's all natural. The only place where she *MIGHT* have done something would be her nose. However from all the pics I have seen I doubt that she did.
Keep in mind though, that many are jealous of her long hair and certain physical features that they themselves cannot get e.g. a pointy nose, nice skin, and a nice body that is attributed to exercising.
Nowadays what asian women DONT realize is that you need to freakine exercise to stay young and look great! I strongly believe that's part of JJH's trait of looking so great. She is by no means the best looking when you view her up close or without makeup. In fact compared to many LA Koreans here, she wont stand out at all unless you recognize her.
When I go to the gym, any asian i see there is not that great looking. But you can tell they exercise and have a great body, and that pushes their score up at least 50% compared to those meaty asians that dont do anything. Their all lookg very young and have great legs despite probably being much older than me. I guess i'm very sneaky in observing huh?