It's probably "normal" for her, and clearly she's getting some nutrition or she'd be ill. Maybe she will always have a mild appetite, or maybe something will kick in later. All of 3 my kids went through funny "no eating" phases, and then would go through weeks of being hungry all the time. Growth spurts and activity levels affect that, as you well know.
When our then-14 month old daughter went through a very long phase of "gagging" and not swallowing food, the Dr told us to ignore it, assume it was about texture (and possibly attention), and look at her diet as being comprised of 7 days of food, as opposed to worrying about each day's intake. That made perfect sense, and when I wrote down what she did eat over the course of a week, it was far more than I thought. I was told to not wean her yet (she was still getting a few a day), and to use a "follow up" formula if she would take it, until she outgrew the phase. That went against everything I had read, but was spot on, as she was more content, and it was only for a few more months. I didn't have a harder time weaning her later (as I thought I would). Also, I gave her lots of yogurts and mashed veggies or fruits, etc, that she could feed herself, and that seemed to maker her want to eat more. It was a mess, but who cares?!
However, my nephew was like this from the time they started him on solids, and at age 4 was still not outgrowing it. Finally, the pediatrician recommended they see an Ear, Nose and Throat specialist, who found an abnormality in his tonsils that was not apparent to their regular Dr. After minor surgery, he started eating normally! He's 12 now, and eats like a horse, by the way!
There is probably nothing wrong with your daughter, but I had to mention this as a possibility. Good luck and try not to worry!
