maybe over fed , but could be colic, I'd talk to her Dr about it, that's just my personal experience with my daughter, she doesn't fuss unless she's tired or hungry

@supermom1104, but it happens even when she's slept a whole lot. I thought it could be colic? I also try burping her, changing her diaper, etc but she's still fussy sometimes.

overly tired, I usually have to rock mg daughter to sleep when she gets like that