These days making her a special bento that includes her favorite snacks would be an alternative when we dine out with friends, when it is not very nice to make everyone else follow our little girl's taste buds. Other than that, a book and a pen would be necessary to keep her occupied.
She would normally practise her numbers and alphabets, but she gets bored very quickly. This happened last weekend when we met up with some friends for dinner. She started with her very nice work and then she just scribbled when she was bored.