Yes, you can use Betadine.
Try cleaning out the ear. Apply 1 drop of Peroxide, let it bubble up some of the gunk, wipe it clear. Apply only 1 drop at a time, then clean the ear and if you need to, work on it over the course of a few days if she becomes distressed or lethargic.
Hopefully with cleaning it out, it will make her more comfortable.
Metronidazole may be helpful so I would start it. @Eggcessive or @dawg53 may suggest something different.
Try cleaning out the ear. Apply 1 drop of Peroxide, let it bubble up some of the gunk, wipe it clear. Apply only 1 drop at a time, then clean the ear and if you need to, work on it over the course of a few days if she becomes distressed or lethargic.
Hopefully with cleaning it out, it will make her more comfortable.
Metronidazole may be helpful so I would start it. @Eggcessive or @dawg53 may suggest something different.