R.,
My daughter is the opposite, she is ravenous at breakfast, but lunch and dinner are more challenging. I figure she is healthy and happy and as long as I put the food in front of her, she will eat when she is hungry. Of course, I do my best to make stuff she will like, and can eat with her fingers. The biggest breakfast hit I came up with was to make a big batch of really thick oatmeal the night before, using milk, rolled oats, and a bit of oat bran. While it is cooking I add a dash of honey, raw sugar, or pure maple syrup. Then I pour the thick oatmeal in a cake pan to cool and sprinkle on some cinnamon. I put it in the fridge overnight. In the morning, I cut it into squares , drizzle on some honey, and serve it with a side of fresh fruit. One batch will keep for a week, so you can make a lot and simplify your mornings. She gobbles it down and I know she is getting a good start on the day. Hope this helps. If all else fails, just keep trying, she will come around. Pressure tends to have the opposite effect, so remember to relax, and let her go at her own pace.
Good luck to you!
-K.