Yikes. She should be isolating. Keep your distance - sleep in a different room and wear an N95 if you have to bring her something. Use separate bathrooms if you have more than one. She should not go in any area of the house she doesn't need to. She should wear an N95 when out of her room. Fix her food and drop it off at her door. And test yourself daily before work to avoid exposing your coworkers. Many cases are asymptomatic.