Toddler not eating

I have a 15 month old that has always given me a hard time with eating. Shes VERY picky and rather just have the puffs, mum mums,ect. She never wanted anything to do with baby food. And I can only get select real foods in her. She would eat breakfast sausage toast eggs chicken and a few other things but nows shes like refusing everything again. She does take 8 oz of milk during the day time. Im starting to lose my mind. All I can get her to eat are the snacks I said before and veggy straws. Idk what to do. I feel like im failing as a mom. I know she has to be hungry and sometimes shell get hangry and eat like a bite and then wants nothing to do with it. Help this momma out!!! 😭😩😭😩