Unfortunately, there's not a lot that she can do unless she knows the cause. The only thing that she can do at home is flush the eye well with some warm saline (run it from the inner corner to the outer). Then blot it dry very gently.
These little guys are prone to allergies and eye issues so be sure and see the vet with him for an ocular exam to find out what's going on if this continues.
Let me know if you still have questions.