Stargazer Stella is an important quest to do because if you do her quest she will then read the stars for you which will give you various temporary bonuses.
To do this quest you first need to be level 20 (I think). The easiest way is to quest/level up your way to Paradise and pick up 3 soaps. Then teleport back to Blooming Cora.
In Blooming Cora talk to Stargazer Stella in her tent. Her conversation is pretty ambiguous so you may have to go through it a couple of times until you get the quest to get her a business license. Once you get her quest go to the top middle of Blooming Cora and talk to Don Guivanni.
Don Guivanni will explain that he stinks and needs a bath. He asks for 1 soap. But really he wants 3 of them so you have to do the quest 3 times. If you were smart and brought 3 soaps with you from Paradise then this quest will be a snap, just keep talking to him and giving him soaps. Eventually he will say that Stella is cleared to do business on the island.
After you get Don Guivanni's permission go and talk to Stargazer Stella again. She will then read the stars for you at any of her business locations.
