My 3 year old won't eat anything I make for her. I try to give her balanced meals, but all she wants is peanut butter and jelly, Mac and cheese, and other junky food (which is fine sometimes, but it's literally all she ever wants) I want to say "eat what were all eating or don't eat at all" but she is already underweight (3 years old, 37 inches tall, 26lbs) so letting her not eat really isn't an option. I don't know what to do and I'm open to any and all advice!