you seem to have a good amount of knowledge of this....I understand the right eye is the one with the larger pupil ?? is that right? is she able to move her eyes all around and fully?
she does not have a 3rd nerve palsy, that would make the larger pupil eye the involved eye and it would track poorly and have a severe droop. Now the left eye has a slight droop and has a smaller pupil....this would be consistent with Horners in the left side but the pupil abnormality should be more noticeable in the dark situations. So with this the abnormal pupil would be the left pupil. My experience is that most often there is some physiologic anisocoria and nothing is wrong. I think this warrants a visit to the ophthalmologist for their evaluation and management. I wish her well, Dr. Stevens