As aly said, take her to the vet, Ticks
down her ear canel are hard to reach.
Some ticks carry disease that can be transmitted to people and dogs, so when you find a tick you want to have it carefully removed as soon as possible. Have your vet show you the proper way to remove ticks for when they are NOT in the ear.
As Aly also suggested, ask your vet
to suggest a good tick preventive that
is on the market.
Let us know how the tick removal goes.