Since you started the Oxytet I would finish the course of treatment.
The tissue above her eye looks swollen and the eye is sunken. It may be respiratory disease, especially if you have 2 birds with similar symptoms. For me, it would be odd to have 2 at the same time symptomatic of Ocular Marek's. Ocular Marek's to my knowledge is not accompanied by swelling so I would take a guess something else is at play.
@Eggcessive may be able to offer more suggestions.
The tissue above her eye looks swollen and the eye is sunken. It may be respiratory disease, especially if you have 2 birds with similar symptoms. For me, it would be odd to have 2 at the same time symptomatic of Ocular Marek's. Ocular Marek's to my knowledge is not accompanied by swelling so I would take a guess something else is at play.
@Eggcessive may be able to offer more suggestions.