If you're referring to when she was younger, whoever killed her parents knew she was still alive but did not know if she was a child or a girl so the garden was the safest place.
If you are referring to after she has blossomed there was nothing else to do, now her appearance was clear that it was due to the bloom and the smell that emanates would attract anyone. ^^
It is all explained in the last chapters. ^-^
I was referring to why teenage Dohwa didn't stay in hiding longer until she couldn't hide anymore. As far as the aunt was concerned, the parents and their child died together. So it wasn't like anyone was looking for her. And I was under the impression that the royal was going to take care of young Dohwa. So I'm wondering what went wrong. How did we get from the royal taking care of Dohwa to Dohwa entering the Moonlight Garden. Was she discovered to be a flower maiden, and then forced into the Moonlight Garden? Or did Dohwa go there willingly to have access to the flower garden for her potions.
Maybe I'm just overthinking things(⌒▽⌒)

Some questions have been answered, but there's one thing I still don't get. Why did Dohwa have to go into the Moonlight Garden at all? Couldn't she have just stay in hiding longer.