How do I get Wu to sell me healing herbs

Hint 1 of 8:

You have to get her to talk to you first.  There's a question above on that.

Hint 2 of 8:

Now you'll notice she needs some very raw ingredients.

Hint 3 of 8:

Have you seen any sea gulls lately?

Hint 4 of 8:

Go back to the dock.  There's a gull there.

Hint 5 of 8:

Think large quantities of fiber.