If she likes to take baths, bathing helps a lot with the itchiness and helps soften those pin feathers. So you might want to offer baths daily, be it tub baths, nice wet greens to roll in on the cage top if she comes out, on the cage floor, or even clipped to the side of cage near a perch she likes to hang out on.
Even a misting will help..room temp water, and always mist from above like rain.
Once those bigger feathers(flight/wing feathers) start to drop you'll know she's in a major molt and you should increase the protein in her diet. Feathers are comprised of 90% protein.Increasing protein in her diet will help her to complete her molt quicker, be less stressful, and produce healthy feathers.