Wow Haruhi is something else.. Amazing.
I think she is real, here's why:
If she's grown that much in 3 years you'd expect to see some sort of skin changes.
If you take a look at the picture in her bra (which is mind blowing), you can see a few little dimples on her left boob. This qualifies as a skin change.
The dimpling is caused by enlarging fat cells pulling on the connective tissue of the breast. Some cells are more specialized to hold together the structure of the breast, most are fat cells. When all the fat cells around a connective tissue cell enlarge quickly, they puff out and the connective tissue cell doesn't, causing a little dimple. There's a word for these skin changes in medical speak, peau d'orange, which can be seen in breast tissue disorders or in macromastia/gigantomastia... It can be worrisome if there are also "inflammatory" skin changes but her skin looks good, it's not red, there's no dry peely skin, no cuts or abrasions, doesn't look infected at all. Also she has a very mild peau d' orange if it qualifies as that at all. I mean, yes, she probably should see a doctor, but right now she looks great!!
She's someone to celebrate!! Here's to her health and good spirits.