You were right that the spray was the problem. In the original game Lala's perfume puts a 40-second scent on you (Rose Scent, a small speed slow), and Lana only takes the quest while that scent is still on. That 'scent still on' check was never wired here, so Lana refused everyone and just said her normal lines. Now accepting from Lala sprays the scent (you will see the Rose Scent buff icon for 40 seconds) and Lana takes the quest while it lasts. Same fix for Freesia Scent and Lavender Scent. LIVE. Re-test: accept Rose Scent from Lala in the Kerning Square Lobby, then talk to Lana before the buff runs out. If it runs out, ask Lala to spray you again.