chick not wanting treats

as the title says, this chick won’t even blink at mealworms, veggies, watermelon, you name it. yesterday i took her out from the run to cuddle her on the grass. i kid you not, an earthworm arose from the dirt and started wiggling around. i placed the chick next to it and she didn’t even bother to peck at it! i even held it in the air for her. is she stupid? why won’t she forage? the other chicks her age love digging and going through leaves. they know when it’s mealworm time and they go batshit crazy when i through them snacks. she however just doesn’t care

this is my favorite chick. she never imprinted on me but since she was 5 days old i have spent every day just holding her. she doesn’t follow me, she doesn’t care about the snacks i give her. clearly she isn’t normal because every other chick around her is doing it. i think she may just be too dumb. anyone else have a similar case? will she grow brain cells as she matures?