There are two opthalmologists I recommend in this area. Dr. Julie Hempstead at Gulf Coast Veterinary Specialists and Drs. Hermann and Swanson. They have whatever eye drops are necessary for conditions.
Since you said this is an emergency, my guess is this eye looks bad. This could be an eye ulcer and if so, must be treated correctly. She MUST be seen ASAP or could lose her eyesight. Treating with OTC meds is not a good idea.
Here are the numbers for the above vets....note that they are both called Gulf Coast, but are different places and vets.
Home | Herrmann, M K - Houston, Texas Ophthalmology ? Gulf Coast Veterinary Specialists