13 month old barely eating ?

So I’ve posted about this before but I see no improvement. My daughter hasn’t been the greatest eater ever. However, I did expect it to get better. She’s 13 months now, I try and prepare 3 small “meals “ for her a day and for the entire day she barely eats the equivalent of half of one of the meals. She breastfed and basically drinks when she’s hungry. She’ll taste things or play with it but not enough to be considered eating. I offer her snacks as well. She’s always been on the tiny side so Ive been a little concerned. I asked the pediatrician at her 1 year check up and she wasn’t really concerned. She gave me a few suggestions none of which seems to be helping. Opinions, thoughts, experiences ?