Thats how my daughter has been for the past month. She eats and ten mins later shes hungry again. Thats NOT an exaggeration lol. Shes eating like my teenage brother haha. Then i noticed all her pants are getting too short. Sounds like your daughter is going through one as well.
Idk about that but sounds like shes going through a major growth spurt :) My soon to be 5 year old daughter did the same but I changed up her snacking routine so she stays a lot fuller now. She has breakfast at 8, snack, lunch at 11:30,snack at 2:30, and dinner at 5. Idk if ur already giving snacks in between but maybe try that lol? If that doesnt work im sure its just a growth spurt and she'll settle back into normal eating habits. Good luck!