Sharpening Instruments

Hello, Help! I am so frustrated. My co worker and I have both been practicing hygiene for over 10 years. I sharpen my instruments regularly, often chairside during appointments. I find I need to replace my graceys every 5 months or so and the sickles etc, a bit less often. I also use different stones depending on the need/instrument etc. My coworker on the other hand sharpens her instruments maybe once a month. She has never sharpened chairside and only orders new instruments every year or so. Maybe even less often. Her stone is so worn it has enormous grooves in it. Obviously, my boss finds it strange that I go through instruments so much quicker than my coworker. I am the first one to admit if I missed a bit of calculus yet my coworker proudly claims that she never misses calculus. How is this possible??? Her instruments are terrible, her explorers are bent, she rarely brings a patient back for a second appointment. Frustration is building quickly. Help! Any advice? Thanks in advance, Daw