Since my Siamese bob-tailed Manx came home from the vet spayed and vaccinated, while living in Vegas back in 2005-2006, she has had this reoccurring runny eye. I understood at the time that these procedures done at the same time are not recommended due to complications which could be caused by doing so, but will be done when necessary, which was the case. I was wondering if this might be the cause of this problem with her eye, and why only one eye?
Also, what can be done to help put a stop to this?

The best way to get a correct diagnosis and treatment would be to take her to your vet. I hope this will be taken care of, especially if she has been suffering with this for seven years.