How turned are her ears? You can start posting them if you like to encourage them to stand, however some GSD's will never have erect ears.
If you would like to learn how to post, this video will explain how: https://www.youtube.com/watch? v=bLX6PIrMN_A
As for her tick problem, if you can visit your vet, ask him to perscribe Revolution. It will kill of ticks, fleas and worms.