The initial event hasn't started. But yes I do have the potion set in my inventory. Wait to replay I haven't played the game in a while
I just saw an old trigger that may cause a problem. Can you try to click the potion set in your inventory and then revisit Stella? Cause the old trigger might cause a bug while the whole potion set in owned, but if it's used once and only the transfer-potion remains, then it should trigger Stella's growth event properly.