She has 4 dogs, Thumbelina, Tinkerbell, Bessie Moo, and Tulip. :)
you can't
You can get one by gem hunting with Iridessa
internet
DEFINITELY purple feathers!
Playing the leaf game
your stylus is the little pin like thing n the side of your Nintendo DS. when it says "hold your stylus on Tinkerbell" it means hold down your stylus (as described above) and move it around on the screen. (i home this information has been useful to you :D )
Mariana is in the Pixie Hollow tree in the item shop.
talk to silvermist and play the dewdrop game
In the game Tinkerbell for DS, you can find water lilies in the Pixie Hollow Garden area. Look around ponds or bodies of water within the game to locate the water lilies.
go to silvermist and catch the dew drops(mini-game).
I think it is Silvermist because it shows a water drop