First I would have rinsed it with a solution made especially for eye rinses. Then if that didn't help I would have called the vet. If there is a scratch on the eye from something blowing into it, it needs special eye antibiotics. Also, eye infections can be either bacterial or fungal. With the first, you use antibiotics and with the second, you use antifungals. If you misdiagnose, and use antibiotics when you need antifungals, you allow the fungal infection to go wild.
Since you've already used the antibiotics, I would watch it very closely for the next 12-24 hours and make sure that she's not in pain, there's no more discharge, etc. If it gets better, great. If not, definitely call the vet. To tell whether the eye is still hurting or not, look at the eyelashes of both eyes. They should be symmetrical. If one eye is more wrinkled or eyelashes pointing down instead of out like the "good eye", she's still hurting.
ETA - If it's been a few days that you've seen swelling, you may already have an infection going and it would be good to call the vet. It could be something simple to fix now, that would cause scarring/vision problems/loss of the eye at the worst case scenario if not properly diagnosed or treated.
Last edited by Ladytrails; 10-08-2011 at 01:18 PM.