How old is your bird? Have you ever wormed her, or had a fecal test done to check for internal parasites? It looks like intestinal shed, seeing that occasionally can be nothing to worry about. Seeing a lot of it, or seeing it sometimes can be a sign of internal parasites. If you can get a fecal test done, that would be what I would do. If you don't have a vet that will do it, then I'd consider worming her to see if it clears up. Most of the time you will not see any worms in the droppings, so not seeing them doesn't mean they aren't there, the fecal looks for the microscopic eggs that are shed in droppings.