the photos aren't clear I can't see it well but with it without seeing it ears shouldn't be tapped except when the dog is 6 months because that's the normal max time of both ears to be up (it might stand after but impetiant people tap them).
the problem might be one if the both one, the nerve in her ear is dead or broken two,the nerve is weak and it might stand up after a very long time.
but since her ears were standing well before then it might be the first one so I suggest that you take her to the vet (might not help but try)
RIP , Lexy 18/2/2014-1/5/2014 (parvo victim)
11/4/2014 (how to live without her?)