Explanatory note: This NPC has changed in the game HKO as of 2011. This entry describes a Beta-fact of 2008.
Hana is now called Usahana. She can still be found in Sanrio Harbour at the lake but will give you different quests from those back in 2008, including visiting/cleaning her 3 gardens and obtaining special seeds.
Hana is a quest-giving NPC in Sanrio Harbour, located in the middle of Hello Kitty Lake, right in the middle of the Sanrio Harbour zone.