My Lady has had dry eye (KCS) for several years. Unfortunately, it is a permanent condition. Tear stimulators like Cyclosporin and Tacrolimis can help produce tears. In addition, you need to apply artificial tears (Genteal Severe Eye Gel is the best) 4-6 times a day.
I'd suggest you ask your vet for a referral to a canine ophthalmologist. Not only should she be monitored at least once a year, dogs with KCS are more prone to eye ulcers, infections, etc.
Here's a great article about KCS:
KCS (Dry Eye)