You should quite spraying her for awhile. The mites can develop a resistance to it. I usually spray 3 to 4 weekly sprayings and then stop and I haven't found anymore pests on my birds. I just recently started spraying in the coops. I done 2 weekly spraying and in 2/3 days will do a third spray. I've been spraying because there were quite a lot of flies around the coops. I have to clean out the poop pits under the coops. I haven't done it lately because we have been getting rain every day. The permethrin treatments have taken care of the flies for now.