M.J.
I've always followed the rule where if they say it hurts, are crying or can't sleep, get the antibiotics. That being said if she doesn't have these problems, but you are worried, get it checked. Motrin or Tylenol might relieve some of her discomfort.
My oldest had TONS of ear infections and he just had one last year at 13! It was pretty bad by the time he told me about it and I got him in to the dr. So maybe she has a high tolerance of pain.
All you can do is get it checked and go from there. If she gets lots of ear infections, talk to the dr. about preventative treatment. Maybe she has allergies. Maybe she needs tubes.
Good luck!
M.