Aromatherapy oils can add a nice calming atmosphere in the home and essential oils can have a therapeutic effect on dogs but they are highly toxic to cats because their livers lack the enzymes needed for their systems to metabolize them. Hydrosols are okay. This is the process where essential oils are diluted is a special steaming process.
If your cat loves to drink water from a running tap, consider getting a drinking fountain for her. Cats in the wild drink running water and a pet drinking fountain recreates this in the home.