First off, thank you both for your replies.
Deborah, they have been trying their hardest to get ride of the ear mites ever since she contracted them, but a day of missed treatment and that's all takes. They might have them mostly gone, but I haven't talked to them about the mites for a couple of months, that being the last time I saw them.
Julie, I will let them know about Revolution, I am sure they treat for fleas and ticks. By 'cocker ear' I meant literally the shape of the ear. I was trying to indicate that they are long, hanging ears and since they aren't shaved on the inside, HAIRY! It's a wonder they can tell apart the mite leavings from her black hair.
Sorry to give you the wrong impression, and for the record, my family has had to this date, three cockers (only one ear infection, between the three) and an English Springer Spaniel mix, no ear infections from her. And perfectly clean ears for the two and a half months we fostered a cocker. So I agree about the clean ears.