I assume that the business is doing okay that's why she wants to expand to other snacks...mishakaki would be my first choice for her to add on the list as it requires 3 to 4 small pieces of meat plus veggies which is very profitable and liked by many. Add smocha which is smokies or sausages together with chapati and a touch of kachumbari ,loved by many young Kenyas. Add boiled eggs too which is very profitable too. On the side if it's possible she can add a small merchandise business with the modern keyholders , sweets, bubblegum,water, biscuits, energy drinks ,sodas, she can introduce one item at a time as the business grow. She can introduce delivery services too to her loyal customers at a small fee like 30bob for who are far kidogo and free of charge for those who are near her and her business. With proper planning she can expand her business very comfortably#growinyourbusiness#scalingup#smallbusiness#snacks#businessidea