Even if it is not dry eye, I would still take her to an eye specialist if you can. It will give you peace of mind and reassurance that her diagnosis is correct and the best course of action is being taken. It sounds like you've been dealing with this for a long time. I'm a "straight to the point/problem solver" though so I, personally, wouldn't have the patience to make educated guesses and try treatments. I would want to leave it to the specialists (which I did!).
I hope Mylee's eyes improve and that you and your veterinarian can figure out the cause of her discomfort.