Help! My 9 month old daughter doesn't like to eat much.

So at first my daughter Niara would only eat home cooked meals instead of the Gerber pureed fruits and veggies. She likes foods with flavor. But now she is only eating oatmeal for breakfast, and only eats about a spoonful of her home cooked meals now. I've just started giving her formula this past week. She only has it 3 times a day and I'm still breastfeeding her as well. I don't know what to do. The only thing she actually has been eating more than a spoonful of the last 2 weeks is oatmeal. Her pediatrician said her weight is fine and just keep encouraging her to eat. I still feel so bad though. Any parents gone through this? What did you do? Thanks